The pump and switch are integrated into one unit. The switch can be automatically controlled according to the level of the water level. No additional floating switch is required. It cannot be used to pump oil - otherwise the pump will not work. Just lightly filter the filter to clean the antifouling. Suitable for pumps with 600 and 750 GPH (2271 & 2838 LPH) at 12 V or 24 V.