The Pure Blue H2O 3-Stage RO Replacement Filter 3-Pack is a set of white water filter cartridges designed specifically for the Pure Blue H2O 1:1 RO System. Made of polypropylene and carbon materials, these filters utilize a 3-stage filtration method including reverse osmosis, carbon block, and sediment filtration to remove contaminants such as chlorine, sediment, lead, cysts, VOCs, and heavy metals. With a capacity of approximately 6-12 months per filter, these replacement cartridges come in a pack of 3 and are manufactured in the United States. The filters are sealed and compatible with reverse osmosis water filtration systems, providing clean and safe water for your household.