FITS IN-Ground AND ABOVE Ground POOLS This inline automatic chlorinator will work for either in-ground or above ground pools. Large capacity 9-pound. tank will accept sticks, 1-inch or 3-inch 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 includes the unions and pipe fittings necessary to connect to 1-1/2-inch plumbing. Designed to be installed inline.