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Lately we have been having issues with cast iron 180 deg. Boilers knocking. We have done the basics from adding Fernox products, and flushing boiler with vinegar. Fernox has worked well except in 1, a 15-year-old cast iron slant fin. It started about a year ago. We can not get it to stop after trying Fernox and circulating vinegar only through boiler. Any suggestions?