Replacement filter for models with WaterSentry filtration system (Coolers + Fountains);Filter should be replaced every 1,500 gallons or 1 year after installation;Equipped with quick-disconnect, 1/4-turn installation, as well as automatic inlet shut-off valve that closes when filter is removed;Designed to reduce lead, particles and chlorine. Also reduces odors and discoloration from incoming water;Filter is tested and certified to NSF 42 and 53 for lead, Class 1 particulate, chlorine taste and odor reduction;Filter is tested and certified to NSF/ANSI 401 for the reduction of microplastics