The 9100 incorporates the time-tested design of the 9000 in a rugged glass-reinforced Noryl twin-tank control valve. Perfect for light commercial/heavy residential systems that require twin-tank conditioning capabilities. Six-cycle control regenerates with soft water immediately when needed keeping the system clean for optimum operating efficiency. Regenerates as often as every 90 minutes if required. Continuous fl ow rates up to 18 gpm on ¾" valves 21 gpm on 1" valves. Handles up to 16" softeners. Softeners include Fleck 9100 meter valve with 1600 time brining 3/4" stainless steel bypass blue polyglass mineral tanks charcoal 15" x 17" x 36" brine tank (except 80000 and 110000 grain) w/#500 air check and standard or fine mesh resin. All about water hardness and water softeners How to select a water softener Replacement Control Heads Replacement Resin Great Tool Water Softener Calculator

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