50" Waterfall Opening. Measures 36" x 65" x 36". Provides biological filtration to ponds over 700 square feet, up to 15,000 gallons. Maximum recommended flow 250 gpm. Includes two 3" bulkhead fittings allowing you to enter incoming water from either side of filter. Filter comes standard with three filter pads and six mesh bags for filter media. Ships via motor freight.