Water taken by WJWW from Shaft 22 is fluoridated and chlorinated by NYCDEP at Kensico Reservoir.  Subsequently, at its Larchmont Station, WJWW provides additional chlorination, adds caustic soda to increase pH, and adds a blended poly-orthophosphate as a corrosion inhibitor.

Water taken by WJWW from the Kensico Reservoir at its Rye Lake Station is fluoridated, chlorinated and provided with a blended poly-orthophosphate at the source.  After the water passes through WJWW’s Purchase Tanks, caustic soda is added for pH control.