REMEMEBER IF HARD WATER IS CAUSING CALCIUM BUILDUP IN YOUR BONG, JUST LET SOME WHITE VINEGAR SIT IN THAT THING FOR A FEW MINUTES AND SHE'LL BE LOOKIN BRAND NEW. JUST DONT SMOKE WEED WOTH THE VINEGAR INSIDE PLEASE
I am not nearly advanced enough to come away from such a maneuver unscathed