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 depth 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