CH-709 is a tri-acid cleaner, liquid concentrate. It is used to clean copper surfaces by removing chromates and oxidation. CB-709 contains a concentrated blend of acids and surfactants developed and designed to remove and dissolve surface films. It does not contain any ammoniated products, which would produce problems during waste treatment. CH-709, nitric and phosphoric acids. It is much more “equipment-friendly” than halide based acid cleaners.