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stored in a concrete tank until used. The Zeolite treated water is distri­buted to the Magnesium Plant Boiler House, the Hospital boiler and laundry, and is used for tempering all of the domestic supply. Stabilized water to be blended for the domestic supply is drawn from behind a weir at the entrance to the stabilized water clear well. The lip of this weir is about three feet higher than the surface of the water in the Zeolite water clear well. The pipe line which conveys stabilized water to the suction header of the domestic water booster pumps is equipped with a hydraulically operated control valve, and a venturi tube. The pipe which conveys Zeolite softened water from the zeolite olear well to the pump suction header is always completely open. The total flow of mixed water passes through another venturi tube at the discharge of the booster pumps. Between the stabilized water and mixed water venturi tubes and hydraulically connected to them is a differential transmitter with pilot valve and a regulating valve, The regu­lating valve can be set to proportion the soft and stabilized water in any desired ratioi The pilot valve at the differential transmitter operates the controller on the stabilized water supply line. There are three horizontal centrifugal pumps to supply pressure In the housing system. The normal operating head is 39 pounds. One pump discharges 500 g.p.m.* one 750 g.p.m. and the other 1500 g.p.m, against that head. Capacity of the pumps working in various combinations1 The housing booster pumps are controlled by an automatic float switch located in redwood tanks which serve as a standpipe for the domestic water distribution system. The are six stendered redwood tanks of 50,000 gallon capacity each, which provide a total storage of 300,000 gallons. The tanks are Inter connected with two 10 inch welded steel pipe connections to the domestic water system. To supplement this storage in case of a power failure of long duration, there is a vault near the water treatment plant. At a moderate operating speed this pump will deliver as muoh water as all of the electric powered booster pumps combined. Pump Ho 12 1 &3 2 1 & 3 1, 22 &4c 33 Discharge at Design Bead 500 g.p.m. 750 g.p.m. 1500 g.p.m, 12^0 g.p.m, 19^*0 g.p.m. 2270 g.p.m. 2770 g.p.m. 11