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My wet return is under my basement floor. After the condensate returns, the level in the sight glass gradually goes down, but stops just below the LWC line. Then, of course, the feeder kicks in. This usually takes about 2-4 heating cycles, and amounts to 3-6 gallons a day. My fear is have a leak under my floor. I'm guessing the water does not go lower in the glass due to the Hartford loop, and that the 3-6 gallons a day that go through the feeder are going somewhere else. The run under my floor is about 12 feet long, so wouldn't there be something (other than the water level) that would indicate that much water loss, such as a sagging in the (concrete over dirt) floor or foundation? It doesn't look like steam is going through the chimney, and there is a leak towards the end of the main in my crawl space (I can't imagine that much water escapes as steam through that leak). I probably can't afford to fix something like that and I'm worried my house will be destroyed. Also, the water in the boiler was pretty clear for a couple weeks when I turned the system on in September, but has become pretty dirty over the last few days.