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brown sludge vs black sludge
I bought the house last winter in the middle of the heating system. So this is my first time starting the system after the summer. So opened the mud leg valve, boiler valves, LWC, etc., to bleed and remove the crud from the bottom, and refilled the water level, before firing it up for the first time tonight.
Before firing it up the crud was that familiar brown rusty look. But after the boiler was on for a short while, it all turned black. The water level glass was almost pure black, and the water out of the low water cut-off was also black. Is my boiler trying to tell me something?