This Rainbow HC-3340 commercial and high capacity automatic chlorine/bromine feeder holds 40 pounds of tablets and treats up to 61,000 gallons with bromine and up to 332,000 gallons with trichlor. High capacity for 1-inch hard plumbing installations. Completely enclosed system, no special venting required. No escaping gases. NSF listed and 50 PSI maximum operating pressure. Measures 50-3/4-inch length by 7-3/4-inch height by 7-3/4-inch width.