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PSR® has been formulated to rid your potable freshwater system of odors & discoloration by attacking the source. Scale builds on low lying, flat sections of your system, allowing bacteria to form. PSR® targets these areas and brings new life to your system. Use PSR® to remove hard water stains, limescale, rust, or any other mineral-based scales deposits. formulated to meet strict NSF requirements for use within municipal drinking water systems. This is a Marine Industry first!! Non-corrosive to all metals, plastics, gaskets and other materials.