For use with all PUR faucet filtering systems, this replacement cartridge works on your drinking water in 3 stages. First, it reduces sediment, making it cleaner. Second, it reduces lead, mercury, cryptosporidium, giardia, pesticides and industrial pollutants, making it healthier. Third, it filters the water over a bed of minerals, making it taste better. Lasts up to 2-3 months/100 gallons. Faucet system sold separately. Made in USA. 4.5Hx2.25" dia.