The string wound filter has a deep graded honeycomb structure, dense near the inside core and more open and sparse near the outside edge, forming an effective depth filtration filter, catching larger particulates first and then smaller near the center core, effectively increasing the dirt holding capacity of the filter. Significant Difference between String Wound Filter with Melt-Blown Filter. Flow Rate: String Wound Filter > Melt-Blown Filter. Dirty-holding Capacity: String Wound Filter > Melt-Blown Filter. Service Life: String Wound Filter > Melt-Blown Filter. 20 Micron 20″ x 4.5″ universal string wound filter cartridge fits most 20 inch big blue filter housings, as prefilter of reverse osmosis (RO) systems and whole house water filtration, as well as variety of commercial and industrial water treatment systems. Remove 99% particles, silt, sand, rust and other undissolved particles in dirty water. As the first line of defense in the filtration system, protect your water using appliances and plumbing for cleaner water, improve water quality and taste. Food grade 100% Polypropylene material, lead and BPA-free. Non-toxic, odorless, no leaching or secondary pollution. Providing a healthy, safe water-filtering experience. Our high dirt-loading capacity sediment filters can last up to 60,000 gallons. For better water quality, recommended replace it every 6 months, depending on the quality of the original water source and application type. 3M Aqua-Pure 5618903, AP810-2. Aqua Sun International SWS-BB. Express Water WH300SCKS, WH300SCPS, WH300SCGS. ISpring FP25B, FP25BX2, WGB22B, WGB22BM, WGB32B, WGB32BM. Pentair DEV910837, DGD-5005-20, EV910837, P5-20BB. Pentek CWD-PENTEK-DGD-5005-20, DGD-5005-20, P5-20BB. Ronaqua 10S-20BB5, BBSED-20B4, 2C-20BB5. This sediment water filters intercept all sands from raw water so there are no sands entering the water pipes in the house, which protects water lines as well as the faucets to prolong the lifespan and provide pure water for you. Under Sink Water Filter. You will no longer have to clean the strainer of faucets every month if installing this filter. All you need to do is change-out the filter regularly. Great for removing grits, clay soils, sands soil and iron scales, etc. It can be as a pre-filter to remove the most of sediments from raw water before which entering the follow-up water treated system, such as the water softening process or other filters. “Green” & Water Saving. Rainwater/rainfall collected from the roof can be filtered and used for watering your garden, flushing toilets, doing laundries, washing cars, showers, washing dishes, or swimming water in pools. 1 Pack: 1 x Water Filter 2 Pack: 2 x Water Filter 3 Pack: 3 x Water Filter 4 Pack: 4 x Water Filter 6 Pack: 6 x Water Filter 10 Pack: 10 x Water Filter.