PermaClean® PC-33 is a membrane cleaner developed to support the cleaning of acid-insoluble sulfates of calcium, barium and strontium as well as calcium fluoride. PermaClean PC-33 is also effective in removing iron oxides and hydroxides as well as calcium carbonate, though PermaClean® PC-77 or PermaClean® PC-87 is preferred for these foulants. PermaClean PC-33 is highly effective when used in combination with high pH detergent cleaners such as PermaClean® PC-67 or PermaClean® PC-98 to help remove organic substances and microbial slimes. Removal of acid insoluble deposits. (like calcium sulfate, phosphate, EDTA based)