Hello, my pool water level has dropped 1"-1 1/2" from normal, as indicated by the 'normal' calcium ring around the tiles. I was instructed to turn my autofill "nut" counterclockwise to reset and fill the pool. Is this correct, how does the autofill work? Oh and I cannot seem to turn the nut it is on very tight. The pool was recently re-plastered so I doubt it is due to any leaks. Thanks for any help. I'm a pool newbie.