The SELTZ D SKIM DC is an electronically controlled pump that guarantees high performance in terms of water flow and air intake. Designed specifically for use in skimmers, it guarantees perfect mixing of large quantities of water and air thanks to the special needle impeller designed in Hydor’s laboratories. In case of blackout and resulting increase of water level in the sump, the electronic controller delays the start-up of the pump avoiding the overflow of liquid from the skimmer’s extraction container.