The Pulsar® 73379 Precision 30 Chemical Feeder Only is a high capacity erosion (HCE) feeder that is compact and lightweight with a modular design. This feeder uses calcium hypochlorite briquettes that works in conjunction to produce a fresh, concentrated liquid chlorine solution for clean and sanitized water. This system can be optionally upgraded with an ORP (oxidation reduction potential) kit, which is sold separately.