Designed for use with the poolife® NST® Feeder Tablet technology, this truly unique feeder allows for the slow-dissolving cal hypo tablets to be slowly and continually fed into the pool though the existing plumbing. Once installed, simply add the tablets periodically and adjust the control valve to maintain a 1-4 ppm chlorine level. THIS FEEDER IS DESIGNED FOR USE WITH THE NST FEEDER TABLETS ONLY Important Information: Do not use NST Skimmer Tablets in the feeder Do not use any other type of chlorine tablet in the feeder NST Feeder Tablets sold separately