Pentair R171096 Rainbow  320 Automatic In-Line Chlorine/Bromine Feeder For Pool And Spa Rainbow 320 automatic chlorine/bromine in-line pool and spa feeder Holds 11 large or 98 small bromine or slow dissolving trichlor tablets Treats 6,500 to 27,000 gallons bottom feed and 18,000 to 70,000 gallons top feed Uses 1/4-inch feeder hoses, control valve and fittings Measures 17 3/4-Inch H, 5-Inch W ,10-Inch D