Note: The water level must be higher than pump head to prevent overhead and damage of pump.Please Clean the cartridge frequently to prevent clog of cartridges.Low Water Level: The filter can be used in very low water level turtle tank, which would let your turtles breathe easily and grow faster. Physical, Chemical and Biological filtration: The filter cartridges include active charcoal and would easily block physical particles and remove chemical hazards. The waterfall feature allows the enough oxygen to enter the water and enhance the growth of nitrobacteria. Flow rate is 225 GPH. Dimension is 3.8inchX2.4inchX7.5inch (L X W X H).