The Pure Blue H2O 3-Stage RO Replacement Filter 3-Pack is designed specifically for the Pure Blue H2O 1:1 RO System, ensuring compatibility and optimal performance. Made with polypropylene and carbon materials, these filters utilize a 3-stage filtration process including reverse osmosis, carbon block, and sediment filtration methods to effectively remove contaminants such as chlorine, sediment, lead, cysts, VOCs, and heavy metals from your water. With a capacity of approximately 6-12 months per filter, this replacement cartridge pack includes 3 units, each measuring 2.5 inches in depth, 14 inches in height, and 7 inches in width. Enjoy clean and safe drinking water with this high-quality water filter cartridge set.