What's included: 4 pieces of 5 micron sediment filters: With only a five micron rating, it is effective in removing dirt, rust and sand particles. 4 pieces of granular activated carbon (GAC) filters: Adsorbs chlorine, halide, organic contaminants, odors, and other impurities that contribute to bad taste and odor. 4 pieces of 5 micron carbon block filters: Removes any remaining chlorine and organic chemicals. Further enhances the taste of water. 1 piece of 500GPD Dual-Flow reverse osmosis membrane: A thin film composite (TFC) high quality membrane that processes 500 gallons per day at a 1: 1 waste ratio, best in the market. 2 pieces of post carbon inline filters: This post carbon filter removes objectionable tastes and odors to enhance the quality of your drinking water. Why iSpring: Located 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.