Join Date: Jun 2009
Location: St Louis
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Re: How do you remove hard water calcium stains off glass.
The white stains you see may not be stains at all. Glass dissolves in high pH water. Glass usually doesn't wet smoothly and leaves water spots in irregular patterns. The water stands on the glass, dissolves very tiny amounts of glass and dries. Left behind are tiny pits in the glass, hard water stains and that cloudy look.
If the razor blade doesn't take it off, if CLR doesn't take it off, then vinegar and even Muriatic acid won't either - the glass is etched. Even if you polish it, it won't come completely clear due to the uneven pitting of dissolving glass in water.
27 to 35 tanks from 5 to 55 gallon fresh water tanks. 300 to 350 gal in all.
Spawning mostly Killies, Live bearers, American & west African Cichlids, Pencil fish. 4 species of spawning Corydoras, & some Bristle nose Plecos. Other less than 6 inch species from time to time.
In St. Louis
Change As Much Water As Often As You Can