This filter keeps a healthy level of fluoride (a water additive that promotes strong teeth), Reduces Chlorine, Atrazine, Lindane, Lead, Turbidity, and Cysts. It is recommended that you replace your water filters every 6 to 8 months. Our filters are guaranteed to last for at least 8 months or your money back! Carries WQA Gold Seals, ANSI 42 Certified:Certified Green Product and Ready to Install. High Quality, Cost-Effective Alternative to Factory Original. Lifetime Shelf Life! 6 Month Warranty After Initial Use! No Hassle Return Policy! Sealed and Ready to Install! No Tools.