AQUASCAPE SIGNATURE SERIES BIOFALLS FILTER 2500 (2" BULKHEAD) Made from durable rotational molded polyethylene ensuring maximum strength. Filters up to 2500 gallons. Reversible waterfall lip. Expanded surface area filter mats. Brass hardware resists corrosion. Circular shape provides maximum strength and makes it easy to camouflage into the landscape. Rated for pumps up to 5,000 GPH. Includes: removable upper tray, 2 poly-flo ESA biological filter mats, filter support rack, patented non-cross threading screws, 21.5" reversible waterfall lip, 2 2" bulkhead ports.