The color is still under there.
Scale does not stain the tile, it sits on top of it. Taking it off is why the colour underneath comes back instead of being painted over.
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Before and after
The same tile, twice
Every job on this page is a waterline that looked like the left side and now looks like the right.
Ask Paul what it takes
Desert water leaves its minerals on the tile every time it evaporates at the waterline. Over a season that film hardens into a pale crust that a brush will not shift, and most owners assume the tile itself has gone.
It has not. The work is matched to the surface so the scale comes off the glaze without taking the glaze with it, and it is done with your pool full.
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