AquaPill pool salt cell guard is a "must have" for pool owners using salt water chlorinator systems and is easy to use and works by simply dropping into a floating chemical or chlorine tablet dispenser or into your swimming pool's skimmer Features IncludeSuper easy to use by simply placing into a floating chlorinator or chemical feederInhibits scale build up on chlorinator salt cellsPre-measured, time released dosagesLong lasting professional strengthUse 1 pill for every 20,000 gallons of water in your pool