So when servicing my well system and adding a shut off valve, I noticed that the galvanized pipe that was used to setup the pressure tank, switch, gauge and boiler drain valve had a white residue inside it. It wasn't a crusty buildup, just a thin layer and I could wipe it with my finger and it would coat my finger as well. This is before the water softener and I have very hard water, 65 gpg of hardness. So any idea what the white residue is? Is it just because of the hard water or is it...
White residue inside pipes
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