Simple, economical and professional way to chlorinated your pool automatically. Spagold's efficient, corrosion-proof automatical feeders install easily on new or existing pools or spa and hold up to 4.2lbs. of large of small tri-chlor slow dessolving tables or sticks-enough to provide a week supply of chloirne senitizer for large pools and longer for smaller pools. The easy to use integral dial control valve lets you accurately adjust the rate of chlorination needed to keep your pool sparkling pure.