This clear out assists in keeping a healthy level of fluoride (a water additive that promotes strong teeth), Reduces Chlorine, Atrazine, Lindane, Lead, Turbidity, and Cysts. It is suggested that you simply replace your water filters each 6 to 8 months. Our filters are guaranteed to last for no less than 8 months or your a reimbursement! 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 Bother Go back Policy! Sealed and Able to Install! No Tools.