I had a couple of gallon jugs of distilled water which froze and cracked in the garage. There's a clearly a white chalky line were water ran across my floor. Is this salt or is it possibly some efflorescence pulled out of the concrete by the water? Thinking I might be better off using rain water or Lake Michigan public works water after allowing it to offgas the chlorine for a day or two in my yellow Ford OAT concentrate. Thoughts?