Automatic In-Line Chlorinator Chemical Feeder 9lb CapacityEfficient and maintenance free our durable corrosion proof automatic chlorinators are ideal for new or existing pools or spas and work automatically with your pump and filter system. This automatic in line chemical feeder is completely enclosed therefore there are no escaping fumes and it doesn't require any special venting. The easy to use integral dial control valve lets you accurately adjust the rate of chlorinating needed to keep your pool and spa