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The Half Off Ponds BioPro Pressurized Filter utilizes mechanical, biological, and UV filtration in a single unit and can filter up to a 4,000 gallon pond with light fish load or a 2,500 gallon pond with a 50 pound fish load.With a multistep filter pad design, the allows for the removal of larger debris while still allowing for biological filtration. After this dual stage process, the water is sent to an 24-watt UV clarifier for a final polish and clarification of algae. Maintenance is simple with an easy turn dial to backwash function.The visible indication lets you know when backwashing (cleaning) is needed. Simply turn the dial and the backwash will be activated to expel the debris from the filter.