Purity Defined - Our combination of Reverse Osmosis and Deionization creates the ideal home system for the purest water possible. The four stages of filtration before Deionization dramatically increase the lifespan of your filter and gives you a lower cost than Deionization alone. Great for softening hard water at your point of use without adding sodium. Start making better tasting food, ice, coffee, and drinks. Extend the life of your water using appliances by keeping impurities out of them!