Aquascape® BioFalls® 09020 Signature Series 2500 Filter. The Aquascape Signature Series 2500 BioFalls® Filter is ideal for filtering ponds up to 2,500 gallons, providing efficient biological and mechanical filtration. Its durable, rotationally-molded, rounded polyethylene shape maximizes structural strength while making it easier to camouflage into your landscape. Able to handle flow rates up to 5,000 gallons per hour, the filter can be installed in a wide variety of applications. The Aquascape Signature Series 2500 BioFalls® Filter includes our patented non-cross-threading screws and reversible 21.5-inch waterfall spillway lip, providing the option of installing a natural stone spillway. The included rock and plant tray can hold rocks, plants, and gravel, helping to naturalize the BioFalls into the surrounding area. All Signature Series BioFalls Pond Filters include a limited lifetime warranty, ensuring year after year of trouble-free use.