Bestway FlowClear Filter Pump 1500GalThis pool filter system can help keep your water clean and clear of debris. Filter cartridge pumps are an economical and convenient way to keep your pool water clean and are so simple to set up. The 1500gal Flowclear Filter pump comes with a filter cartridge that can be simply and easily replaced. Even if you are swimming in your pool every day, a cartridge will last a minimum of two weeks, and much longer if you keep your pool covered and protected.