This is probably an Arizona specific question but has anyone out there ever used a company called Arizona Bead Blasting Inc?
My pool is only a year old but the calcium scaling on the spillway is ugly. My local water is never below 250ppm and my latest pool tests show a CH of 400ppm. My CSI is usually slightly negative so my Ca scaling is really just a function of the wet tile evaporating when to pumps shut down and leaving behind a Ca scale.
Apparently they specialize in cleaning Ca off tiles by using a special salt blasting process which uses Epsom salt (Mg sulfate). The Epsom salt is a lot softer than the tile surface but hard and dense enough to mechanically remove the Calcium. The process avoids having to use acid to clean off the Ca.
They say they vacuum it up afterwards but MgSO4 has a very appreciable solubility in water so I imagine Mg levels will rise.
Any thoughts from those our in the SW with calcium issues?
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