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Posted by HeatPro on June 10, 2009 at 11:32:34:
In Reply to: sludge and tank build up posted by Daniel on June 10, 2009 at 09:41:02:
Depending on the brand, most manufacturers will void a warranty on a boiler that has chemicals added. But, since you no longer have a warranty for a used boiler, that is of no import. One reason they don't want chemicals added is that it can eat seals and open pores plugged by previous corrosion.