This Rainbow HC-3330 commercial and high capacity automatic chlorine/bromine feeder holds 30 pounds of tablets and treats up to 40,000 gallons with bromine and up to 160,000 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 40-inch length by 7-3/4-inch height by 7-3/4-inch width.