Chlorinators allow you to add controlled amounts of chlorine into your pool. They are attached to the output pipe after the filter. 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: IN-LINE CHLORINATOR - is attached directly into the plumbing system and you cut out pieces of pipe and install the whole system. OFF-LINE CHLORINATOR - sits on a stand and has two hoses – INPUT and OUTPUT – that lead from the output pipe to the chlorinator. This is used when the plumbing system on your filter has minimal space. This guide shows you how to install a Powerclean Ultra in-line Chlorinator.