Sanitization made super simple 

Rainbow® high capacity feeders are one of the easiest ways to sanitize large residential and commercial swimming pools using either chlorine or bromine slow dissolve tablets or sticks. These heavy-duty, high capacity feeders provide automatic sanitization for pools up to 332,000 gallons. 
They are designed for off-line plumbing installations using 1" PVC pipe and are available in three sizes to fit a variety  of pool applications .

Feature:

• Heavy-duty control valve for accurate feed rate adjustment.
• Completely enclosed system prevents fumes from escaping – no special venting required.
• New easy access design for recharging and servicing.
• NSF listed.
• One-year warranty. See warranty for details.