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. Fits standard 10 inch filter housings, including most name brand models. Well packed for freshness - Each cartridge is individually wrapped with manufacturing date Why iSpringLocated in Alpharetta, Georgia for over a decade, iSpring water systems LLC is a family owned company specializing in reverse osmosis water filtration systems. Our products include residential and commercial reverse osmosis (ro) systems, whole house water systems, Ultrafiltration systems, shower, faucet, and counter top filters, filter cartridges and housings, ro coolers, and kitchen faucets and fittings. Our aim is to make high quality drinking water accessible for all households. With affordable pricing, solid quality, prompt delivery, and top notch customer service, we hope to assist in bringing you great water for years to come.