I am doing research on the effects of acid washing pebble tec. A couple of years ago, my pool guy - who I trusted implicitly - suggested acid washing my pebble tec plaster. He said it would brighten it up. Ok. Sounded good. Well, it appears not. My plaster is now ruined. There is a clear pattern where acid wash would sit SLIGHTLY longer than on other areas. In other words, on the flatter surfaces. It's not on the walls at all but for one little round spot over by the light on the deep end which I noticed on the day the acid wash was completed. But I discount that as an outlier. The damage overall wasn't immediately evident. It got increasingly worse last year and this year. And I'm told it can continue for several years. This season, I felt pebbles on the steps and found them in the pump basket. My pool guy - now out of business, no less - claims that the damage is from hose water or chemicals or the age of my plaster. My plaster was perfectly intact until the wash, my chemical use has been consistent since the pool was built, and hose water? I'm told that isn't even possible. So...is acid wash indicated to brighten up pebble tec? Cuz the only brightening I have now is what looks like a disease where the pebbles fell off, leaving darker blotches all over the stairs, on the shallow end by the stairs and beyond, trailing down from the shallow end all the way to the drains and around the drains. It's an eyesore. I'm just beside myself. Any feedback is greatly appreciated.