Rola-Chem Pool Sentry Automatic Water Leveler M-3000The Rola Chem Pool Sentry M 3000 is a portable, automatic water leveler designed to maintain proper water levels in pools, spas, and decorative ponds without constant supervision. This device automatically adds water when levels drop due to evaporation, splash out, or normal usehelping protect equipment and ensure consistent circulation. The Pool Sentry connects to a standard garden hose and uses an adjustable float mechanism to maintain a preset