Specifications & Performance Claims This system has been tested according to NSF/ANSI Standard 42 for the substances listed below. The concentration of the indicated substance in water entering the system was reduced to a concentration less than or equal to the permissible limit for water leaving the system, as specified in NSF/ANSI 42. The testing was performed using spiked tap water at a flow rate of 4 GPM (15.2 L/min.), pH of 7.5 ± 0.5, pressure of 60 PSIG, and temperature of 68 ± 5°F.