The iSpring 4.5” x 20” 3-Stage Whole House Water Filter Replacement Pack is a high-quality water filtration system designed to provide clean and safe drinking water for your household. This pack includes 3 stages of filtration, with the first stage removing sediment particles, the second stage utilizing a carbon block to remove chlorine and other chemicals, and the third stage a lead resin filter. Easy to install for a hassle-free purification process. With this replacement pack, you can enjoy crystal clear water straight from your tap. New and unused in opened box – resealed / filters in unopened sealed plastic. Save!