An acidic cleaning liquid with a phosphoric acid base, it is specifically designed to remove metallic oxides, rust, calcium carbonates, and other inorganic scale. AlfaPhos also inhibits corrosion of metal surfaces in heat exchanger equipment. For rust and metallic oxides, it is typically mixed in a ratio of one part AlfaPhos to four parts water; for calcium carbonate and other inorganic scale it is typically mixed in a ratio of one part AlfaPhos to nine parts water.
The recommended operating conditions are 50–70° C (122–158° F) for 2 – 6 hours. The pH of the solution should be below 2.5 at all times; when it is too high, add more AlfaPhos.