This pump is suitable for dirty water with a max particle size of 35 mm the float switch provides automatic power on off a thermal protection switch protects the motor from overload ideal for emptying of ponds and cisterns emergency drainage in case of flooding eg basement rooms or bins emptying swimming pools technical specifications motor 230 v 50 hz 550 watt max flow rate 10 500 l h max delivery height 7 m max immersion depth 7 m max grain size 35