This inline automatic chlorinator works perfectly for in-ground or above ground pools. It accepts sticks, 1-in or 3-in tablets into its large capacity 9 lb. tank. Regulate the speed at which the tablets dissolve, depending on your pool's chlorine demand. Constructed of heavy duty resin, this unit comes with the unions and pipe fittings necessary to connect to 1½-in plumbing. Designed to be installed inline.