All-in-one pressurized filtering system provides mechanical, biological and UV sterilization/clarification for clear and healthy pond water. Pressure-Flo Filters filter 1250 L to 6000 L (330 to 1585 US GPH) providing filtration for ponds up to 12110 L (3200 US gal.). Laguna Pressure-Flo Filters feature a revolutionary patent pending Backwash System that completely cleans the entire surface of the foam filters without removing the filter lid. An easy-view cleaning indicator signals when it’s time to perform backwash cleaning.