BADU®Koi sand filter with BADU®Porpoise self-priming pool pump The BADU®Combi unit is a pre-fabricated filtration system ready to install. It consists of BADU®range of Koi sand filter, BADU®Porpoise range of self-priming pump, three-piece high quality housing and a fully integrated DB box. The size of your swimming pool determines the required BADU®Combi. The BADU®Porpoise range of pumps remains unsurpassed in its quality of material, workmanship and functional durability. The BADU®Koi range of sand filters is strong, reliable and simple to operate. For total dynamic head (m) and water flow rate (Q in m³) for the BADU®Combi unit, please see performance curves on the BADU®Porpoise range of pumps and BADU®Koi range of filters. The BADU®Combi range is fully factory tested and under normal operating conditions carries a 12 month ex-factory warranty on the pump, BADU®Koi filter and on the Electrical box from date of purchase.