Fluval 203 Foam Filter Media Sponge - 4 Pack
Premium quality foam filter insert designed and manufactured specifically for use with the Fluval 203 Filter Module.  These foam discs effectively removes particulate matter mechanically and allows thriving populations of beneficial, nitrifying bacteria to aid in the establishment and maintenance of the biological balance in the aquarium.Usage Directions:Rinse each foam disc thoroughly before initial use.  Remove top module cover and insert two foam discs.  Put module stack into filter case and reassemble filter for operation.  Rinse foam filter discs periodically in luke warm water.  After the initial nitrogen cycle run-in period of about six weeks, replace the bottom disc every three months or more frequently for maximum biological efficiency.  Move the top disc to the bottom position and place a new disc on top of it.  To ensure continuous biological activity, never replace both discs simultaneously.  Please refer to the instructions that came with your filtration system for additional information and maintenance directions/recommendations.