Aquadyne Model AD4000 Filter Perfectly suited for koi ponds up to 3500 gallons. Supports up to 65 pounds of fish. 1.1 Cubic feet of bead media. Diameter 18"�, height 34"�, maximum pressure 50 psi. Average water to backwash 30 gallons. Average flow through filter 1000-2800 gph. M

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