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AQUA MagazineThis Rainbow 300 automatic chlorine/bromine off-line pool and spa feeder holds 11 large or 98 small tablets, treats 12,000 to 48,000 gallons. Operates on pressure side of pumps. Uses 1/4-inch feeder hoses, control valve and fittings. Completely enclosed system, no special venting required. No escaping gases and retrofits into existing pools or spas. NSF listed and 50 PSI maximum operating pressure. Measures 14-3/4-inch length by 23-inch height by 22-1/4-inch width.