The APWCUN-201 is a 2 cu. Ft. acid neutralizer. The flow rate is rather impressive at 7 gallons per minute, ensuring you never run out of pH-treated water. This is particularly useful if your household is struggling with corrosive, acidic water. 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. It has a unique up-flow design that helps to reduce back-washing.