Plaster color change
Our light brown plaster (quartz) is 7 years old and changing colors. It almost looks like the color is only in the surface coat and that is wearing off? The company that installed it will not even come out to look at it. (They had me email them photos) They first said it was normal fading, then changed to "it's a chemical problem". The chemicals are checked/adjusted at least weekly, so I believe they are fine. However, I do have very high calcium levels in the pool, I believe my pool guy said it was over 800. We have hard water here, but none of my neighbors pools have levels like this and their pools were filled years before mine. Does anyone have any ideas how to restore the color or at least stop further change? Thanks!