This in-line chlorinator is designed for permanent installation in the pool water return line. Our free standing automatic chlorinator will work for either in-ground or above ground pools. This chlorinator holds 9 lbs. Of chlorine tablets. The chlorinator is fully adjustable so you can regulate the speed at which the tablets dissolve, depending on your pool's chlorine demand. This unit is made of heavy-duty resin. Union fittings are included for easy installation of pvc and flexible piping.