Abstract:
An aquarium includes a first chamber arranged to contain a first volume of liquid, a dry chamber that is adjacent the first chamber and defines a second volume, and a removable element at least partially disposed within the dry chamber. The removable element is selectively removable from the dry chamber. The aquarium also includes a filter at least partially disposed within the removable element, and a pump including an intake and an outlet. The intake is arranged to draw a flow of liquid from the first volume of liquid during pump operation. The aquarium also includes a tube having a first end connected to the outlet and a second end movable between a first position in which the flow of liquid passes through the filter and is then discharged into the first volume and a second position in which the flow of liquid flows directly into the first volume.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Application No. 61/711,572, filed Oct. 9, 2012. 
    
    
     FIELD OF THE INVENTION 
     The present invention is directed to aquarium filtration and maintenance. 
     BACKGROUND OF THE INVENTION 
     Residential aquarium-keeping is an established industry in the United States and around the world. The most basic version of an aquarium consists of a transparent container for aquatic life to be viewed and housed within. These containers are typically constructed of either glass or a transparent plastic material such as acrylic or polystyrene but may be made of other transparent or semi-transparent materials. Basic aquatic environments of this nature are limited in their ability to sustain suitable conditions and water quality for all but a handful of robust and hearty fish. More appropriate for the health and well-being of the aquatic organisms is the addition of filtration, lighting, oxygenation, temperature control, and chemical and biological balance. 
     The need for temperature management of an aquarium varies significantly based on external environmental conditions as well as the species of aquatic animal or plant kept within the aquarium. Temperature is maintained by either adding heat to the aquarium when the water temperature is below what is desired or by chilling the water down to the “proper” or desirable temperature. In a condition in which heating is required, an external heating element is added to the tank to raise the temperature of the tank. These heating elements are fundamentally resistive heating elements contained within a waterproof plastic, glass, or metal housing. The heater is placed within the water chamber of the aquarium and contains thermal sensors/switches to raise the temperature of the water. There are a variety of control and temperature management systems, but all currently available heating elements contain an electrical wire that leads into the water column of the aquarium to connect a power supply with the heating element. These types of heating elements can be used on micro desktop aquariums of as little as 0.5 gallons up to aquariums containing hundreds of gallons of water. 
     Temperature management for cooling down an aquarium to a desired temperature is typically performed through external plumbing of the aquarium to a “chiller”. This is often done through external plumbing and “removal” of water from the aquarium to maintain water temperature. These external cooling systems often have a heating system included as well. These systems are most typical of large aquatic environments where the total water volume of the system exceeds 30 gallons or more, and more typically 55 gallons or more. 
     Lighting needs of an aquarium range from decorative to functional. In the simplest version, decorative lighting is a low intensity light either in or on the aquarium that is used to provide an aesthetic appeal to the consumer. Functional needs vary greatly and are dictated by the species present. Lighting used within the aquarium industry varies from incandescent, LED, fluorescent, metal halide and even plasma lighting. The major trends are towards LED lighting. In decorative in-tank lighting, the LED light is often coupled with an air-stone or other decor to provide an aesthetic appeal to the consumer. In these systems there is often a power cord for the light (or multiple power cords for lighting) as well as an air-tube that enters into the water column. In external lighting, the power cord attaches to a light that either is integrated into the tank or sits on its surface to illuminate the aquarium. 
     Chemical balance for an aquarium is essential to sustain life in the aquarium. Ammonia, nitrite and nitrate are toxic elements to fish and need to be properly maintained. Depending on the species of fish in the tank, proper balance of other chemicals is also critical to aquarium health. For example elements such as strontium, calcium, magnesium, phosphorus, iodine as well as the pH of the system require proper balance. In advanced systems, water chemistry can be continuously or periodically monitored to ensure proper balance. Some systems can even continuously balance these elements. Biological balance is important as nitrosomonas and nitrobacter bacteria species complete the nitrogen cycle and naturally transform Ammonia and nitrite to nitrate (the least toxic of the three to aquatic life). 
     Dissolved oxygen is a fundamental requirement for aquatic life. In most aquariums, oxygenation is maintained through transient surface agitation from filtration, normal gas exchange (if the load on the aquarium to surface area of the tank is not too high), or through addition of air through the system through airstones and an air pump. 
     The single most critical element to successful aquarium keeping is the aquarium filter. The aquarium filter has been around for over 40 years in some form or another. Filtration systems for aquariums include air filters, power filters, external sump filters, canister filters, hang on filters, “horizontal” above aquarium filters, internal filters and other specialized filtration (including ion exchange, skimmers, etc.). With the exception of specialized filtration, all other traditional filters serve the purpose of moving water through a filtration system to remove impurities from the aquarium. Current technology focuses almost exclusively on water pump driven filtration. In a water pump driven filtration system the water is actively (and mechanically) pushed or pulled through a filtration device that contains filtration media. The filtration system most typically incorporates a variety of filtration methods including mechanical (a coarse and sometimes fine filter material), chemical filtration (most typically activated carbon to treat chemical pollutants), and biological filtration (to allow naturally occurring bacteria to thrive and treat the water). In all water filtration systems the water is pumped from the aquarium into a mechanism that includes some or all of these filtration elements and then returns the water back into the aquarium. For best results the mechanical filtration should be either cleaned or replaced 1-2 times per month, the chemical filtration should be replaced 1-2 times per month, and the biological filtration should be left untouched. 
     Aquarium maintenance is derived from three elements. The first (and partially unnecessary element for aquarium health) is derived from consumer desire to keep an aesthetically “clean” aquarium. This often means removal of algae and detritus from the glass and décor surfaces. This maintenance can often be more problematic to the health of the aquarium than beneficial but is considered a necessary element of aquarium maintenance. This cleaning is beneficial when the maintenance cleans detritus and debris from the gravel/substrate itself. In time, these organic materials will break down into contaminants that can be harmful to fish. 
     The second element is to change the water of an aquarium. This should be done on a partial basis in order to maintain beneficial bacteria that reside in the aquarium. The purpose of doing a water change is to remove naturally occurring chemicals that build up in the aquarium (most critically nitrate) because of the nature of the artificial environment. The rate of buildup is determined based on fish load, plant load, and feeding load on the aquarium. This is highly variable and as such it is recommended that 20-25% of an aquarium be changed on a monthly basis. The effective dilution effect on contaminant level buildup when changed on this schedule has shown to, as a general rule of thumb, keep contaminant levels at healthy levels for the aquarium. In more advanced systems chemical balance incorporates additional maintenance (e.g., additions/resin exchange). 
     The third and final aquarium maintenance required is on the filtration system itself. Mechanical filtration needs to be either cleaned or replaced on at least a monthly basis and chemical filtration should be replaced on approximately a monthly or more frequent basis. It is these combined maintenance elements that both lead to the highest level of consumer frustration, and when not conducted properly, lead to unhealthy aquariums. 
     A water change is currently conducted in only one fashion. Water is “drawn” out of the aquarium effectively reducing the water volume in the aquarium by 15-100% and subsequently reducing the water height in the interior chamber of the aquarium by a proportionate amount. The desirable volume should be approximately 20-25% and can extend to as high as 50%, but misinformation and misunderstanding often lead to 100% water change by new consumers to the hobby. Depending on the size of the aquarium this water change is conducted by the following: 
     Moving the aquarium to a sink and pouring water out to a desired level. Due to weight constraints, this is typically only done on the smallest of aquariums (1-2 gallons and smaller). In order to perform this type of water change all electrical appliances in the aquarium must be removed or unplugged and transferred with the aquarium. There is further risk of disrupting décor, plants and fish through this transfer and pour. 
     Removing water from the aquarium “in place”. This is done by pumping, suctioning, siphoning or physically scooping water out of the tank. This method requires additional equipment not integral and is performed on most aquariums larger than 1-2 gallons. Water is then typically placed in a bucket or other transfer device to be added back to the aquarium. This method of conducting a water change requires external equipment not integral to the aquarium, often is cumbersome and timely to perform, and often times leaves a residual mess that requires further cleaning to complete the water change (for example water dripping on the floor, added buckets, tubes, pumps to clean and store). If not unplugged or performed with care, heating elements can be left exposed to the air during water changes of this nature. This can lead to failure of the heater itself which at minimum renders the heater useless and in a worst case scenario presents a major failure risk. 
     Filtration maintenance is often done at the same time as a water change but does not have to be. This requires removal of the filtration media (mechanical and chemical). In many current filtration systems these two elements are integrated into a single unit. In these systems the entire “cartridge” is disposed and replaced with a new cartridge. In other systems the mechanical and chemical cartridge or element are separate. In these systems the mechanical portion is either cleaned or replaced and the chemical media is replaced. In either scenario the consumer removes a wet element from the aquarium environment and needs to transport the wet, dirty, soiled cartridge to a sink for cleaning or garbage for disposal. In either case the cartridge either drips and drops contaminant onto the floor or counter top until it reaches its destination or some external device is used to prevent this from occurring (often a bucket, tub, paper towel, etc.). In all cases the consumer risks making a mess and/or having additional elements to clean upon completion of providing the maintenance to the filter. 
     SUMMARY 
     In accordance with one construction, an aquarium includes a first chamber arranged to contain a first volume of liquid, a dry chamber that is adjacent the first chamber and defines a second volume, and a removable element at least partially disposed within the dry chamber. The removable element is selectively removable from the dry chamber. The aquarium also includes a filter at least partially disposed within the removable element, and a pump including an intake and an outlet. The intake is arranged to draw a flow of liquid from the first volume of liquid during pump operation. The aquarium also includes a tube having a first end connected to the outlet and a second end movable between a first position in which the flow of liquid passes through the filter and is then discharged into the first volume and a second position in which the flow of liquid flows directly into the first volume. 
     In accordance with another construction, an aquarium includes a first chamber arranged to contain a first volume of liquid, a dry chamber disposed adjacent the first chamber and defining a second volume, and a removable element at least partially disposed within the dry chamber. The removable element is selectively removable from the dry chamber. The aquarium also includes a filter at least partially disposed within the removable element, and a pump including an intake and an outlet. The intake is arranged to draw a flow of liquid from the first volume of liquid during pump operation. The aquarium also includes a tube having a first end connected to the outlet and a second end movable between a first position in which the flow of liquid passes through the filter and is then discharged into the first volume and a second position in which the flow of liquid flows directly into the first volume. 
     In accordance with another construction, a method of operating an aquarium that contains a first volume of liquid in a first space includes operating a pump to direct a flow of liquid from the first volume to a filter via a tube in a first position. The filter is disposed within a removable element that defines a second volume. The method also includes performing one of a filter change and a water change. The filter change includes the steps of moving the tube to a second position to direct the flow of liquid directly back into the first volume, removing the removable element and the filter from the aquarium, changing at least a portion of the filter at a location remote from the aquarium, returning the removable element and the filter to the aquarium, and moving the tube to the first position to direct the flow of liquid through the filter and back into the first volume. The water change includes the steps of moving the tube to a third position to direct the flow of liquid directly into the removable element, removing the removable element and the filter from the aquarium, disposing of the liquid within the removable element at a location remote from the aquarium, adding a volume of fresh liquid to the removable element from a remote source, returning the removable element and the filter to the aquarium, adding the fresh liquid from the removable element to the first volume, and moving the tube to the first position to direct the flow of liquid through the filter and back into the first volume. 
     Other aspects of the invention will become apparent by consideration of the detailed description and accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a fully assembled aquarium with an internal filtration system according to one construction of the invention. 
         FIG. 2  is a perspective, exploded view of the components of the aquarium and internal filtration system of  FIG. 1 . 
         FIG. 3  is a front elevation view of the aquarium and internal filtration system of  FIG. 1 . 
         FIG. 4  is a perspective view of a removable element of the internal filtration system of  FIG. 1 . 
         FIG. 5  is a perspective view of an aquarium with an external/hang-on filter filtration system according to another construction of the invention. 
         FIG. 6  is a perspective, exploded view of the components of the aquarium and external/hang-on filtration system of  FIG. 5 . 
         FIG. 7  is a perspective view of a pump assembly of the aquarium and external/hang-on filtration system of  FIG. 5 . 
         FIG. 8  is a perspective view of an aquarium with an external/hang-on filtration system according to another construction of the invention. 
         FIG. 9  is a partially exploded perspective view of the filtration system of  FIG. 8 . 
         FIG. 10  is a fully exploded perspective view of the filtration system of  FIG. 8 . 
     
    
    
     Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limited. 
     DETAILED DESCRIPTION 
       FIGS. 1-4  illustrate an aquarium  10  with an integrated filtration system  14 . The aquarium  10  is sized and configured to contain fish and other livestock. The filtration system  14  includes a removable filtration element  18  that resides within a dry, back chamber  22  of the aquarium  10 . The element  18  is sized to contain and hold a removable filtration media  26  (e.g., a removable filter cartridge). 
     When the filtration system  14  is in an operating state, water is pumped into the element  18  with a pump  30  (illustrated in  FIG. 2 ) disposed in a pump chamber  34 . The water flows from the pump  30 , through a water tube  38 , and into the element  18 . The water then passes through the filtration media  26  and eventually exits the element  18  through a return spout or ramp  42  that returns the water to a primary chamber  46  of the aquarium  10 . The primary chamber  46  is a viewable container in which livestock and/or an aesthetically appealing portion of the aquarium  10  are situated, similar to a traditional aquarium. 
     The element  18  remains externally dry while in operation, while being a water-tight element to contain water internally. The chamber  22 , which is configured to remain dry, provides a safety backup should any water overflow from the element  18  but fail to enter the primary chamber  46 . The volume of the element  18  is small enough to only contain the filtration media  26 , or as is more preferred, is sized to receive and hold up to 15-25% of a total water volume of the aquarium  10  (i.e., a water volume that resides in primary chamber  46  while the filtration system  14  is not in use). In some constructions the element  18  is sized to receive and hold between approximately 10%-25% of the total water volume. Smaller water changes, such as a 10% water change, more frequently reduces a fluctuation in water chemistry, making a more stable environment. In some constructions the element  18  is an external element that is not integrated into the aquarium  10 . 
     With continued reference to  FIGS. 1-4 , the element  18  provides a way to easily service the aquarium filtration system  14 . As illustrated in  FIG. 4 , for example, the element  18  includes a handle  50 . In some constructions a strap or other element are used instead. The filtration system  14  enables a user to remove the element  18  (e.g., by grasping the handle  50 ), as well as the filtration media  26 , from the aquarium  10  to service or transport the element  18  and the filtration media  26 , without the difficulties of dripping water, re-soiling the aquarium, or other issues associated with traditional filtration media maintenance. 
     When the element  18  is to be serviced, the water tube  38  is easily rotated from the removable element  18  to the primary chamber  46 . This enables continuous water flow during servicing. In some constructions, the pump  30  is turned off during servicing. Both options maintain water levels in the aquarium  10 , thereby providing benefit to the inhabitants of the aquarium  10  and reducing the risks associated with possible electrical failure of a heater when not turned off during maintenance. However, continuous circulation provides added benefits that no current aquarium servicing systems provide. This includes continuous oxygenation, water flow, and water levels. No current water change technology accomplishes any of these three elements, let alone all three simultaneously. 
     With continued reference to  FIGS. 1-3 , the aquarium  10  also includes an under-gravel plate  54  and a plenum  58  disposed beneath the plate  54 . When the pump  30  is operating, water in the aquarium  10  is drawn through the plate  54  and into the plenum  58  by the pump  30 , helping to remove detritus and debris that can accumulate in the aquarium  10 . The pump  30  pulls the detritus and debris into a water tube  62  that extends from the plenum  58  (e.g. extending alongside and underneath the plate  54  as illustrated in  FIG. 1 ) to the pump  30 . The water, detritus, and debris are directed through the water tubes  62  and  38  to the element  18  to be filtered by the filtration media  26 . In other constructions the water tubes  62 ,  38  have other configurations, shapes, and sizes than those illustrated. 
     With continued reference to  FIGS. 1-3 , the gravel in the plate  54  is kept clean by the process of drawing water through the gravel. The combination of the plate  54 , the plenum  58 , the pump  30 , and the element  18  makes maintenance easier for the user and improves success rates in keeping the aquarium  10  healthy. The use of the plate  54  and the plenum  58  also provides additional surface area for anaerobic bacteria to grow in the aquarium  10 , which provides additional health benefits to the aquarium  10 . 
     As described above, the pumping action of the pump  30  occurs prior to the water entering the filtration media  26 . This arrangement advantageously enables direct intake from the substrate plenum  58 , surface skimming, or mid water level draw depending on which is most desired. This is in contrast to other filtration systems where water overflows into a filtration media, and where the pumps are only used after the filtration has occurred. 
       FIGS. 5-7  illustrate another aquarium  110  having a hang-on filtration system  114  that couples to a primary chamber  146  of the aquarium  110 . The filtration system  114  includes a body  116  that remains coupled (e.g., permanently or removably) to the aquarium  110 . The filtration system  114  also includes a removable filter element  118  and a pump  130 , both contained at least partially within the body  116 . The element  118  has a return spout or ramp  142 . As illustrated in  FIG. 5 , the filtration system  114  also includes a filtration media  126  contained within the element  118 , similar to the filtration media  26  described above. 
     With continued reference to  FIGS. 5-7 , the body  116  is a container that is configured to be a dry container but to be water tight as a back-up protection should water start to overflow from the filter element  118  but fail to enter the primary chamber  146 . In some constructions the element  118  is of a minimal volume to contain only the filtration media  126 . In some constructions the volume of the element  118  is up to 15-25% of a total water volume of the aquarium  110  (i.e., a water volume that resides in primary chamber  146  while the filtration system  114  is not in use) to be able to fully accommodate water changes in the aquarium  110 . In some constructions the element  118  is sized to receive and hold between approximately 10%-25% of the total water volume. With the element  118  containing 15-25% of the total water volume of the aquarium  110 , the filtration system  114  is designed for successful and easy water changes in addition to filter media  126  maintenance and changing. 
     With continued reference to  FIG. 7 , the pump  130  includes a water tube  162  that pulls water directly from the aquarium  110 . In some constructions the water tube  162  is connected to an under-gravel plate, similar to the plate  54  described above, to provide the same benefits as the internal filtration system  14 . The pump  130  is configured to be as small as possible and pumps water through a water tube  138  to the element  118 . The water tube  138  is a tube that rotates from a normal, first operation position in which the pump  130  pumps water into the element  118  to a second position that is used to service the aquarium  110  in which the water circulates back into the aquarium  110  instead of into the element  118 . In other constructions the water tubes  138 ,  162  have other configurations, shapes, and sizes than those illustrated. 
       FIGS. 8-10  illustrate another aquarium  210  having a hang-on filtration system  214  that couples to a primary chamber  246  of the aquarium  210 . The filtration system  214  includes a body  216  that remains coupled to the aquarium  210 . The filtration system  214  also includes a removable element  218  and a pump  230 , both contained at least partially within the body  216 . The element  218  has a return spout or ramp  242 . The filtration system  214  also includes a filtration media  226  contained within the element  218 , similar to the filtration elements  26  and  126  described above. 
     With continued reference to  FIGS. 8-10 , the body  216  includes a cover  220  that provides protection over the element  218 , as well as a spout or ramp  224 . As illustrated in  FIG. 10 , the body  216  has an opening  228  that receives the element  218 , such that the element  218  is able to be inserted into and removed from the opening  228 , and such that the spout or ramp  242  rests on the spout or ramp  224 . 
     In some construction the element  218  is of minimal volume to contain the filtration media  226 . In some constructions the volume of the element  218  is up to 15-25% of a total water volume of the aquarium  210  (i.e., a water volume that resides in primary chamber  246  while the filtration system  214  is not in use) to be able to fully accommodate water changes in the aquarium  210 . In some constructions the element  218  is sized to receive and hold between approximately 10%-25% of the total water volume. With the removable element  218  containing 15-25% of the total water volume of the aquarium  210 , the filtration system  214  is designed for successful and easy water changes in additional to filter media  226  maintenance and changing. 
     With continued reference to  FIGS. 8-10 , the pump  230  includes a water tube  262  that pulls water directly from the aquarium  210 . In some constructions the water tube  262  is connected to an under-gravel plate, similar to the plate  54  described above, to provide the same benefits as the internal filtration system  14 . The pump  230  is configured to be as small as possible and pumps water through a water tube  238  to the removable element  218 . The water tube  238  is a simple tube that rotates from a normal, first position in which the pump  230  pumps water into the filter element  218  to a second position that is used to service the aquarium  210  in which the water circulates back into the aquarium  210  instead of into the element  218 . In other constructions the water tubes  238 ,  262  have other configurations, shapes, and sizes than those illustrated. 
     The following is an example of a maintenance schedule to be performed on one or more of the aquariums  10 ,  110 ,  210 : 
     Filter replacement: The filtration media  26 ,  126 ,  226  is replaced by performing the following steps: 
     a. Rotate the water tube  38 ,  138 ,  238  from the first position (i.e., a “run”) position in which effluent water enters the removable filter element  18 ,  118 ,  238  to a second position in which the water re-circulates within the aquarium  10 ,  110 ,  210 . Alternatively, the water from the pump  30 ,  130 ,  230  may be turned off and if necessary the water tube  38 ,  138 ,  238  moved so as to make it easy to remove the element  18 ,  118 ,  218 . 
     b. Remove the element  18 ,  118 ,  218  from the aquarium  10 ,  110 ,  210 . The element  18 ,  118 ,  218  is now a container to carry the soiled filtration media  26 ,  126 ,  226  to service location of choice (for example, a sink, garbage can or other maintenance location. This allows clean service of the filtration media  26 ,  126 ,  226  without re-soiling the aquarium  10 ,  110 ,  210  and also provides an alternative to dripping dirty water, algae and other detritus across the aquarium  10 ,  110 ,  210  floor, etc. when servicing the filtration media  26 ,  126 ,  226 . 
     c. Once at the service location, remove and dispose of the filtration media  26 ,  126 ,  226 . Alternatively the filtration media  26 ,  126 ,  226  may be removed and cleaned. Replace the filtration media  26 ,  126 ,  226  with a new (or cleaned) filtration media  26 ,  126 ,  226  positioned within the element  18 ,  118 ,  218 . 
     d. Transport the element  18 ,  118 ,  218  with the serviced filtration media  26 ,  126 ,  226  in place back to the aquarium  10 ,  110 ,  210 . 
     e. Return the element  18 ,  118 ,  218  into the chamber  22  or the body  116 ,  216 . 
     f. Return water flow to its original path. In the case of continuous water circulation, return the water tube  38 ,  138 ,  238  from a recirculating mode back to a filtering mode. This returns water circulation to flow through the filtration media  26 ,  126 ,  226 . In the example of turning the aquarium water pump  30 ,  130 ,  230  off as opposed to a water bypass, return the water tube  38 ,  138 ,  238  back to its filtering (i.e., first) position if necessary and restart the aquarium pump  30 ,  130 ,  230 . 
     Water replacement: The water in the system is partially replaced by performing the following steps: 
     a. Turn water tube  38 ,  138 ,  238  from the first (i.e., “run”) position in which effluent water enters the removable element  18 ,  118 ,  218  to a position in which the water re-circulates with the aquarium  10 ,  110 ,  210 . Alternatively, the water from the pump  30 ,  130 ,  230  may be turned off and if necessary the water tube  38 ,  138 ,  238  moved so as to make it easy to remove the element  18 ,  118 ,  218 . 
     b. Remove the element  18 ,  118 ,  218  from the aquarium  10 ,  110 ,  210 . The element  18 ,  118 ,  218  is now a container to carry the soiled filtration media  26 ,  126 ,  226  to a service location of choice (for example, a sink, outside, etc.). This quick as well as dry service of the aquarium  10  for a water change occurs without the need for additional equipment or without the normal issues of dripping dirty water, algae and other detritus across the aquarium, floor, etc. when performing a water change. It further aids in small spaces where equipment storage for a water change can be problematic. 
     c. Dispose of the water retained in the element  18 ,  118 ,  218  down a drain. The filtration media  26 ,  126 ,  226  may stay in place if desired. If it is to be replaced during the water change, it should be removed at this step. 
     d. Clean the element  18 ,  118 ,  218  if desired. 
     e. Fill the element  18 ,  118 ,  218  with clean water and add dechlorinator if necessary. Make sure the filtration media  26 ,  126 ,  226  is removed during the dechlorination process. 
     f. Return the filtration media  26 ,  126 ,  126  to the element  18 ,  118 ,  218  if it was serviced or replaced during the water change. 
     g. Transport the element  18 ,  118 ,  218  with clean water back to the aquarium  10 ,  110 ,  210 . 
     h. Return the element  18 ,  118 ,  218  into the chamber  22  or the body  116 ,  216 . 
     i. Return water flow to its original path. For continuous water circulation, return the water tube  38 ,  138 ,  238  from a re-circulating mode back to a filtering mode. This returns water circulation to flow through the filtration media  26 ,  126 ,  226 . In the example of turning the aquarium pump  30 ,  130 ,  230  off as opposed to a water bypass, return the water tube  38 ,  138 ,  238  back to its filtering (i.e., first) position if necessary and restart the aquarium filter pump  30 ,  130 ,  230 . 
     The advantages of the filtration systems  14 ,  114 ,  214  described above include, without limitation, the ability to service an aquarium  10 ,  110 ,  210  while the aquarium continues to circulate water, as well as maintain a constant water level in the aquarium. This is advantageous for a variety of reasons. First, the health of the aquatic life is significantly enhanced by maintaining aeration and circulation. Second, elements such as aquarium heaters that may become exposed under traditional servicing practices remain submersed reducing a significant risk factor to the consumer. Further, the filtration systems  14 ,  114 ,  214  provide ways to access and change aquarium filtration media  26 ,  126 ,  226  in a clean and dry fashion. This prevents re-soiling of an aquarium as cartridges are removed. It also allows for “drip-free” maintenance when servicing the aquarium  10 ,  110 ,  210 . 
     Another advantage is that these filtration systems  14 ,  114 ,  214  introduce a new way of conducting water changes, and that the filtration systems  14 ,  114 ,  214  are incorporated into the aquarium  10 ,  110 ,  210  itself. For small aquariums (e.g., less than 10 gallons) water changes are often performed by moving the entire aquarium to the sink for maintenance and water change. The filtration systems  14 ,  114 ,  214  described above reduce the risks of moving a full aquarium and make it easier for the consumer to service. The advantages are vast in that the filtration systems  14 ,  114 ,  214  address all three maintenance elements of an aquarium. They make water changes easier and cleaner as well as integrated into the aquarium, they make filtration maintenance easier and cleaner, and they make aesthetic maintenance of the aquarium easier (e.g., when coupled with an under-gravel plate  54  which helps to remove detritus and debris that adds to algae growth and other unsightly deposits). The filtration systems  14 ,  114 ,  214  additionally increase the success rates of consumers that are beginning in the aquarium-keeping hobby as they teach how to properly and safely maintain an aquarium for the greatest benefit of the aquarium&#39;s inhabitants. 
     Although the invention has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of one or more independent aspects of the invention as described.