If your water supply is "rich" in Calcium [mine is] then try using some
vinegar to remove the buildup of Calcium resulting from the evaporation of
water in the pot.

I go through this periodically (about once a lustrum). grin

RAM *3

I did this and I think it is what got me to where I currently am. I
also admit to taking the time to be fussy about this Water Pot, when I
should perhaps be doing something more useful for myself and others.

However I am currently planning to put this pot in a fixture of sorts
in my lathe and polish the inside clean and fresh right down to the
bare metal. Then I will go the POR15 route. I also will clean it all
again with some Phosphoric acid as others have recommended.

On a side note:
I had a coffee maker, Farmer Brothers type that had an enormous build
up in the water heater area that was causing it to malfunction. I did
a 24 hour soak with straight vinegar and now it is clean as new.

Thanks to all for the inputs. It is appreciated.
Bob AZ