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Compact wet-dry filters fit comfortably in cabinets without sacrificing functional space. Smart, easy-access sump allows convenient installation of return pump. Wet-dry trickle filter provides efficient biological filtration to process toxic ammonia and nitrite. Includes overflow box, bio balls, drip tray and cover, egg crate, filter pad, return nozzle with vinyl tubing, 1 Inch bulkhead, and 3 ft. x 1-1/4 Inch flex hose. 75CS, 100CS, and 125CS have single 1 Inch intake; 150CS, 200CS, and 300CS have dual 1 Inch intakes. Requires appropriately sized return pump. Additional flex hoses available. WD-75CS, 18”L X 10”W X 16”H, SINGLE INTAKE, 300 GPH, 10-75 GALLONS.