Our printed circuit manufacturing facility is currently investigating ways to reduce the amount of water used in its rinsing operations. I understand that conductivity meters could be used to ascertain the amount of contamination within the rinse water; however, is there a predefined limitation as to the amount of contamination that would be considered acceptable before product quality would be jeopardized. In other words are there any established guidelines to follow when attempting to regulate rinse water flow rates using conductivity as the basis for water quality. Any assistance regarding water conservation would be greatly appreciated.