Safety Material: Food grade 100% Polypropylene material, Lead and BPA-Free. Non-toxic, odorless, no leaching or secondary pollution. Providing a healthy, safe water-filtering experience. Authorized Certification: Tested and certified by NSF International against NSF/ANSI Standard 42 for material requirements. Outstanding Advantages: Compared to melt blown filter cartridge, string filter is best choice to filter water with lots of sediment. *Flow Rate: String Wound Filter > Melt-Blow Filter *Dirty-holding Capacity: String Wound Filter > Melt-Blow Filter *Service Life: String Wound Filter > Melt-Blow Filter Standard Universal Size: 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. Protect Water Equipment: This filter removes up to 99% of sediment, including rusts, silt, sand, and other undissolved particulates from feedwater. As the first-stage filter in the whole house filtration system, it protects your post-filters, water appliances, pipes, bathroom, and kitchen faucets and shower fittings from clogging, providing a healthier filtered water supply for your home. Long-Life Filter: Our high dirt-loading capacity sediment filters can last up to 60,000 gallons. The filtered capacity and change-out cycle depends on the inlet water quality. Replace the filter at least every six months to maintain performance. Higher Dirt-Holding Capacity: 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. Compatible Housings, Filter Systems and Parts: Most brands’ 20″ x 4.5″ housings (Outer diameter 7.3″ at the top and 23.5″ of height approx.) Ace Hardware 4021341 American Plumber 155184-51, W5CPHD Aquaboon AB-1PL20BB1M, AB-1PL20BB5M, AB-1SL20BB1M, AB-1SL20BB5M, AB-1SW20BB1M, AB-1SW20BB5M AquaPure AP800, AP810-2, AP802B, AP802T Culligan 155184, CP5-BB, CP5-BBS, CP5-BBSa Cuno CFS210-2 Dupont HDC3001 Express Water WH300SCGS, WH300SCKS, WH300SCPS, FLTWH2045C, FLTWH2045G, FLTWH2045S Everpure EV910837 Filter Specialist CMMF0520-45W1 Flowmax FM-BB-20-1 FreshWaterSystems MBGC-45200-05, PS-45097-05, PS-45200-01, PS-45200-05 GeekPure 20-inch filter housing, PP20-BB-5, Harmsco HB-20-1W, HB-20-5W, WB-HB-20-1W, WB-HB-20-5W Hydronix SDC-45-2005, SDG-45-2005, SWC-45-2005, SWC-45-2020, HF45 series iSpring F3WGB32B, F3WGB32BM, F3WGB32BPB, F3WGB32BKS, F6WGB32B, FC25B, FP220B, FP25B, WGB12B, WGB22B, WGB32B, WGB32B-KS, WGB32B-PB, WGB32BM Keystone GPC5 Liquatec SPF-45-1005, SPF-45-2005 Membrane Solutions MPP-F20B, PE-F20B Neo-Pure MBGC-45200-05, PS-45097-05, PS-45200-01, PS-45200-05 OmniFilter RS15, RS-15 Pelican PBBB-P20-5, PBB-P20-1, PBB-P20-5 Pentair Pentek DGD-5005-20, ECP20-20BB, EP-20BB, NCP-20BB, R30-20BB, SDC-45-2005, WP5BB20P Pura 33003117 Pureplus PP20BB, PPL20BB Purwater PC05-BB-S ShurFlo 15-054-02 SimPure DB20, DB20P, MPP-F20B-5 SpiroPure SP-DD-5005-20BB, SPC-45-2020 Sterilight CMB-520-HF Tier1 DGD1-20BB, ECP50-20BB, R30-20BB Valuetrex VX05-20BB Watts FM-BB-20-5, FPMB-BB5-20, PWPL20BBM5, WPC1FF20 *The list is under continuous updating. Please contact us via eBay message if you don’t find your system model here. Disclaimer: *This product is a generic item that is designed to replace the original part. *Any brand names or logos are the registered trademarks of their respective owners. *Any use of any brand name or model designation for this product is made solely for purposes of demonstrating compatibility. Widely Application: *Whole House Filtration 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 Filtration 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. *Extend Equipment Lifetime 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. Package Includes: 1 Pack: 1 x Water Filter 2 Pack: 2 x Water Filter 4 Pack: 4 x Water Filter 6 Pack: 6 x Water Filter 8 Pack: 8 x Water Filter 10 Pack: 10 x Water Filter QA: Q: What is a micron rating? A: The unwanted particles found in water are measured in microns. For example, a filter with a micron rating of 5 will filter out contaminants of 5 micron or larger. Our filter with 99% efficiency rating removes 99% of the particles at all above the 5 micron size. Q: How to choose the right size? A: If you choose the right size for your housing, there are not great influence on the flow rate when you replace them. The size is small: there is a significant drop in flow rate. The size is large: there is still some sediment in your water.