This clear out helps to keep a healthy level of fluoride (a water additive that promotes strong teeth), Reduces Chlorine, Atrazine, Lindane, Lead, Turbidity, and Cysts. It’s endorsed that you simply replace your water filters each and every 6 to 8 months. Our filters are guaranteed to last for no less than 8 months or your a refund! Carries WQA Gold Seals, ANSI 42 Certified:Certified Green Product and Able to Install. High Quality, Cost-Effective Alternative to Factory Original. Lifetime Shelf Life! 6 Month Warranty After Initial Use! No Trouble Go back Policy! Sealed and Able to Install! No Tools.