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Brown water in Steam System OK?

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Is it acceptable that the water in the boiler is a brown color or should i keep blowing-down the boiler until the water comes out clear?

We have recently fired up a fairly large steam system in an old church which had been sitting unused for roughly 5 years. The wet return had not been properly winterized, and it needed replaced. Other than that, the system appears to be functioning well thus far, but has still seen little use.

I have been flushing the system each time it has been fired up, and the water has at times been a pretty strong brown color. It can take up to a bucket or two to clean this out, today i noticed that the water is also brown in water column viewing glass.

When it was first cleaned, there was some particulate matter that came out, but that seems to be all gone - just a brown color (i guess very tiny particulate).

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