The Filtoclear from Oase is a top quality product. It has a superior build quality to other pressure filters on the market and has one of the most effective \'easy-clean\' interval cleaning methods we have ever used. When you want to clean the filter sponges there is no need to get inside the filter. Simply switch off the pump, then pump up and down on the cleaning handle to squeeze dirt and debris out of the filter sponges. Once the sponges have had a good squeeze switch the water diverter to \'waste\', switch the pump back on and the dirty water will leave via the waste outlet. Simply repeat the process until the water runs clear. This filter set is designed to serve fish ponds up to 1,500 litres. By adding aeration to the pond the filter will handle a larger volume of water up to 2,500 litres.