About this item Size: Fits most 10" x 2.5" reverse osmosis systems - 3-pack micron water filters. Universal water filter replacement works with all standard 10-inch and whole house RO systems. Premium Filtration: Made of 100% virgin polypropylene microfiber. The string-wound water filter has a deep filtration function with a dense honeycomb structure inside and sparse outside. The string-wound sediment filter reduces sand, scale, rust, silt, and particles by 99.99%. High Capacity: The filter can filter 20,000 to 30,000 gallons depending on water quality. It is recommended that the average household replace it every 3 to 6 months for optimal performance, depending on usage. Multiple Advantages: It has the advantages of high filtration accuracy, large flow rate, small pressure difference, high compressive strength, high pollution resistance, non-toxic and tasteless, and no secondary pollution. Excellent Performance: The wound filter element is made of polypropylene microfibers tightly wound on a porous frame through a specific process. The honeycomb structure is dense on the outside and dense on the inside. With good depth filtration effect, it can effectively remove suspended solids, rust, particles, and other impurity liquids.