NEW Entry level box filter, UVC and filter pump system from the market leader Oase. Quality is not compromised - only the price! The perfect kit for small ponds up to 3500 litres (800 gallons) with fish. In this set your are provided with a box filter and pond pump. The filter has an in-built 9w UVC which stops your pond water going green. The pond pump supplied has a flow rate of 2,500 litres per hour. In operation the pond pump should be positioned at the bottom of your pond - it then pumps dirty water up through the pond hose (3m length of 20mm hose supplied in set) into the Biosmart filter. The dirt in the water is filtered out by multiple filter media inside the filter box housing. Clean water then outputs the filter box via the large 50mm outlet.