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Cleaning Out the Rusty Water
All, I have a two year old Burnham Megasteam 396. It's running very well, but one thing I noticed is that the waterline bounces quite a bit now, and drops down to about 1/4 inch of the bottom of the site glass, which is only about an inch above the marked "Do not operate with water below this line." At the beginning of this last heating season, I spent an hour draining/filling/draining filling/draining/filling the water until it was as clean as I could get it. I then filled to the proper level (about an inch from the top of glass), and it ran like a top all season. So, I suppose this winter's boiler cycling obviously loosened more rust and sludge from the 60 year old pipes and old rads, and this is why the water line's bouncing and dropping more now. My question is this: Is there an additive I can put into the water to help suspend the crud so that when I open the valve at the bottom of the boiler to drain it out, the exiting water will take more of the dirt with it? I don't have the ability to close a valve in the steam header near the boiler to build steam pressure to blast the dirt out through the drain valve, and am not particularly inclined to want to put one of these valves in. Please let me know what you use to clean out the crud. Thanks in advance for your replies.. Chris Mannering