The APWCUN-301 is a 3 cu. Ft. acid neutralizer—one of the best options if you are looking for effective, hassle-free treatment of acidic water. It helps to correct the pH levels of water. It has an impressive flow rate of 12 gallons per minute. The system prevents blue-green staining among fixtures in and around the water supply system. This system aids in protecting the copper plumbing systems from corrosion due to the high acidity level in the water. The new tank design is equipped with a threaded valve to tank connections. The transparent tank provides a convenient method to view the media-bed level. The system does not require a control valve, electricity, or a drain line! A fill-port is included for easy media fills and additions. The APWCUN-301 has a unique up-flow design that helps to reduce backwashing.