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

WJWW’s water taken 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.