Chlorinators allow you to add controlled amounts of chlorine into your pool. They are attached at the end of the return pipe to the pool after the filter and heater. To use, open the top of the mechanism, insert chlorine tablets, and then adjust the amount of the chlorine going into the pool. Typically, they are used in the summer when the pool is used more. There are two types of chlorinators: an in-line feeder which is attached directly into the plumbing system; and an off-line feeder which has two hoses to the chlorinator coming from and returning to the return pipe to the pool. This guide shows you how to install a PowerClean Ultra Off-Line Chlorinator.