... metal parts from any corosion. Also, It can prevent to produce rust after cleaning.Directions1, To remove unstable rust scale and dirt ... to 2 times thoroughly to remove al remining.10, After injecting water, please put in Comstar Scale &Corrosion Inhibitor and Algae ... Color coded to indicate when the scale gone.2, Contains metal corrosion inhibitor.3, Strongly Remove Slime, Urine,mineral deposits&cement ...