This VEVOR 3-stage whole house water filter system is designed to improve water quality for every faucet and shower in your home. It uses a sediment filter to reduce rust, sand, and larger particles, a polyphosphate (PHO) stage to help prevent scale buildup and corrosion, and a CTO activated carbon stage to absorb impurities and odors. Built for convenient installation (floor-standing or wall-mounted), it includes a pressure gauge to help monitor performance and replace filters when needed. It supports a high 15 GPM flow rate for whole-home use and uses universal 4.5" x 20" cartridges for easy maintenance.