The Pool Sentry automatic pool leveler requires no permanent installation and is fully adjustable. Simply snap the housing shells together, thread in the float valve, hook up to a reinforced garden hose and place over the side of the swimming pool. Turn the water on to the hose and the Pool Sentry stands guard over your water level, adding water as needed and never over-filling. The totally portable unit can be removed while swimming, if desired. The Pool Sentry is the perfect solution for vacations, leaking swimming pool, and vacation homes.