FREE STANDING EROSION FEEDERS — Automatic Chlorine/Bromine feeders work on pressure side of pump and are installed downstream of pool equipment. Spa chamber option limits feed rate on 19" feeder for small bodies of water and holds 1/2 lb. of 1" tablets. Unit capacity: 0.5 lbs. small tabs. Flow Rate Indicator and In-Line Check Valve ordered separately.NSF Listed. For Chlorine.