It just says mine that "the spring no longer glows and looks like a regular spring"
ok，it means you will never reset the value of COR to zero，unless you have a save file （before you drinking the spring）.
wait it has a limit?!
yes . when your COR sum >= 100（include before drinking the spring and after it）,you can't reduce COR with the spring..
200 charges at max. once these charges are gone you cannot reduce corruption anymore.
