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How to blow down a boiler
my boiler is about 8 years old and was not maintained, and was not installed properly either! so after reading dans book "the lost art of steam heat" and reading and posting here on the wall i repiped the boiler with a drop header and installed valves for blow down, now I'm just not sure how to blow down the boiler, i put up the pressure to 10 pounds and shut the valves then opened the 2" drain but it still looks dirty, did i do something wrong?? or do i need to do it several times??