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Green additve for steam furnace

Bob_105 Member Posts: 2
Two years ago the plumber added two small containers (about an ounce each)of what looked like green and white powder, which made the water in the furnace a light green. It really kept the water clean and the traps were quieter. Can anyone tell me what it is called and where I can get it. Not too many people in my area know about steam, and the plumber is no longer alive. Please help. Thanks


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