Automatic Chlorine Feeder for Swimming PoolThis automatic chlorine feeder is designed for installation next to your filter system. It is operated by the pressure differences of your system which draws water through the feeder. The control dial is easy to use and lets you adjust the rate of distribution. By regulating the valve setting between FULL (more chlorine) and OFF (less chlorine), you can easily adjust the chlorine feed amount to maintain the proper chlorine residual in your pool.