The BLACK + DECKER 350 gallons-per-hour pool cover pump is specifically designed for the purpose of keeping your pool protected by removing water off the top of swimming pool covers. Its 1/4 HP ensures water removal up to 350 gallons per hour. Save big on energy costs with this automatic switch that can detect up to 1/8 inch of water. Fully submersible and equipped with a specialized pre-filter to prevent clogs caused by debris, this cover pump can run unattended throughout the winter.