The Pur MaxIon water filter replacement 3 count is a set of blue plastic water filters designed for household use. With a 3-stage filtration method involving carbon/charcoal, these filters are compatible with MaxIon and PUR models, specifically removing lead contaminants. Each filter has a capacity of 18C. and comes in a pack of 3, making it a convenient and efficient solution for maintaining clean and safe drinking water in your home.