Vinegar is made by two distinct biochemical processes. First, yeasts change sugars to alcohol. Second, bacteria (“Acetobacter”) convert the alcohol to acetic acid. Vinegar is about 4 to 8% acetic acid. Because vinegar is acidic, it can dissolve mineral deposits left when hard water evaporates.[b said:Quote[/b] (Sszvein @ Dec. 20 2004,10:15)]Actually, even rain water has minerals in it, and vinegar does a terrific job of dissolving them.
So it would be an easy way to make "purer" water without an RO unit.
And its cleaning the tank at the same time.