Tim, it sounds like you may have antifreeze in your system and that green is sometimes an indication of that within your boiler water. Antifreeze does not last forever and will need to be retreated. The only way to know for sure is to have a sample of the water tested. I would contact your plumbing and heating professional to test it and then suggest water treatment.
What product do you suggest for the green oxidation powdery substance that will appear at pipe fittings? Is that oxidation?
Tim, it sounds like you may have antifreeze in your system and that green is sometimes an indication of that within your boiler water. Antifreeze does not last forever and will need to be retreated. The only way to know for sure is to have a sample of the water tested. I would contact your plumbing and heating professional to test it and then suggest water treatment.
The books say the pH of the boiler water should between 8.5 and 11.5. Why do you guys say pH of boiler water should be between 6.5 and 8.5?