AquaPill pool algaecide is easy to use and works by simply dropping into your swimming pool's skimmer Features IncludeEliminates and inhibits the growth of all kinds of algaeNon FoamingPre-measured, time released dosagesLong lasting professional strengthUse 1 pill for every 10,000 gallons of water in your pool to eliminate or 1 pill for every 20,000 gallons of water for algae control