Typically the first stage for any water filtration system, the sediment filter removes dirt, particles, and rust. Made of 100% melt-blown polypropylene, 4-layer filtration. Depending on your water usage and quality, it should be replaced every 3-6 months. Tested by independent third-party to meet NSF/ANSI Standard. Genuine iSpring filter sold directly by manufacturer. Performance and quality guaranteed. Fits standard 10 inch filter housings, including most name brand models. Well packed for freshness - Each cartridge is individually wrapped with manufacturing date.