Laguna Powerflowmax Laguna PowerFlo Max Biological Underwater Filter provides complete and efficient mechanical and biological filtration for ponds up to 3028 L / 800 U.S. gallons. The filter comes with Laguna's unique Universal Click-Fit coupling, which allows connections to 3/4, 1 or 1 1/4 inch (19, 25 or 32 mm) hosing. Two foam filter pads and BioMax filter media are also included