Very hard water here which produces lots of sediment, probably the cause of the rumbling and knocking. I drain 5 to 10 gallons out of the bottom of my tank every 9 to 12 months and am astonished at the amount of white crystals that come out.
If you drain your tank, be prepared for the drain valve to drip after you close it, from sediment left in the seating area. I changed out the cheap globe valve to a full port quarter turn ball valve and no more problem.
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