The Marlin High Rate Sand Filter is in a class by itself. A one-piece fiberglass reinforced tank with UV resistant finish makes for a long, long life.?Optional Top Mount?Multiport Valve?(not included) directs system operation through filter, backwash, rinse, waste, re-circulate and winterize. Heavy-duty closure provides easy inspection and features an easy-to-read pressure gauge and air relief valve. Swing away diffuser allows instant access to sand and all threaded internal parts. 360-degree diffuser keeps sand bed level for extended filter cycles while eliminating channeling. For external use.Model MeasurementgphFor Ponds10039-3/4" x 30" D5880up to 11,500 gallons14045-1/4" x 36" D8460up to 17,000 gallons

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