The easy, economical and professional way to chlorinate your pool – Hayward CL220 Large Capacity Automatic Chlorinator is efficient, corrosion-proof and designed for easy installation on new or existing pools or spas ranging up to a 9 lb. Capacity. The Hayward automatic chlorinator uses large or small Tri-Chlor slow dissolving tablets or sticks – enough to supply three weeks of chlorine sanitation for large pools and longer for smaller pools. The easy to use integral dial control valve lets you accurately adjust the rate of chlorinating needed to keep your pool sparkling clean. Efficient and maintenance-free, this durable, corrosion-proof automatic chlorinator and brominator is ideal for newer existing pools or spas and work automatically with your pump and filter system.