The PUR Water Filtration 6-pack Replacement 3-Stage Filter Pack RF-9999 is a set of blue water filters designed for household use. Made with stainless steel and carbon/charcoal filtration method, these filters can purify up to 100 gallons of water. The 3-stage filtration system ensures clean and safe drinking water, suitable for all PUR and PUR Flavor Options Faucet Systems. This product is a convenient and effective solution for maintaining a clean and reliable water supply in your kitchen.