High efficiency plastic self-priming pump for commercial swimming pools operating at 1,500 rpm. 3 power modes: 3 hp - 4 hp - 5; 5 hp. low sound level: 59 dba. hydraulic efficiency without prefilter 78% (iso 9906 standard). high quality mechanical seal for salt water. high efficiency iec motors (iec 3). standard motor shaft (compatible with any pump manufacturer). gs marked. the pump comes with a pre-filter (in 2 packages: pump + pre-filter). option without prefilter. supplied accessories.