If you don't have room to install your chlorinator in line with the rest of your pool equipment, then you need an off-line chlorinator. This free standing offline automatic chlorinator will work for either in-ground or above ground pools. This chlorinator holds 4. 2 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 and is designed to be installed offline.