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Pond H2o Bio Gravity Pond Filter 1000 Gallon Pond. The PondH2o pond filter box is an outstanding small pond biological filter, that produces clean and clear water for healthy fish and plants to thrive. Strong PVC construction ensures a long lasting product in black color easily blends in natural surroundings.Simple Box filter system - perfect for filtering a small pond, no electricity required (pump needed). The aerated water passes through Japanese matting and coarse / fine filter foam which extract larger pieces of debris. Also included are bio balls which provide a large surface area for nitro-bacteria development, and will help produce and maintain a high water-oxygen level. Thermometer & Indicator built into lid.Includes Japanese mattingCoarse / fine foamBio balls filter media 2 Inch Outlet pipeThermometer built into lidDirty filter indicator built into lid 1000 PGH (6000LPH) max 50mm outlet Inlet hosetail fits 3/4''/ 1''/ 1 1/4'' / 1'' 1/2'' or 20, 25, 32 & 38mm hose Water outlet size 2' Dimensions (H x W x L): 15'' x 10'' x 15'' or 400 x 275 x 400mm Thermometer & Indicator built into lid1000 PGH (6000LPH) max