Rola-Chem M-3000 - Pool Sentry Water LevelerThe Pool Sentry Water Leveler is an automatic water level maintenance product. Using this Leveler will allow pool owners the ability to keep a constant level of water without having to constantly monitor the water while refilling. Using a heavy duty, reinforced hose for a directly supply, the water will stay on at all times when the unit is in the pool, and will automatically add water when necessary. There is a float built into the part that dips