ENJOY PURE CLEAN AND SAFE WATER EVERYDAY with our One Stage water filtration system. Easy to install, no need for electricity, helps to neutralize acid and save on purchased of filter water. Stage One improves particle removal with sediment filter. This can be change in 5-6 months depending on how clean the incoming water. The transparent housing body is made of polypropylene for strength and resistance to chemicals and blue cap and ring are made of high flow polypropylene for toughness.