Multipure Drinking Water Systems carbon block filters have been developed and refined over the last 50 years to help make life healthier. Clean, healthful water that’s free of contaminants improves the world one glass of water at a time, one person at a time. Multipure Drinking Water Systems meet the National Sanitation Foundation (NSF) strict standards for aesthetic effects, health effects, incidental contaminants, emerging compounds and removal of bacteria and viruses. Carbon block filters can treat more than 65 different contaminants, but don’t significantly affect water’s pH (acidity of water), like reverse osmosis. The pore size of the filters can be customized to target certain bacteria and pollutants. Multipure systems leave healthful, naturally-occuring minerals intact.