Hi there, here is an update:

After 24+ hours, there was no change on both affected and non-affected areas where the vitamin C tabs were placed.

We did hear back from the manufacturer. They claim that it IS scale, even though it is smooth. They said one of their display pools did the same thing, and they had to buff it down (after little success with chemical treatment). Our question to him was.... How could that happen? Did you not maintain proper water balance? (How odd for the manufacturer's pool to have problems; they are the pros.) He said the guy in charge of that claims he did maintain proper water. (I just wonder....if our water chemistry has been fairly good/normal, how can this happen so easily? I question the quality control of our pool surface?? I mean, it will likely happen again if we never had water problems. What do you think??? ....I'm ranting)

We will try to use a power buffer/sander as per the manufacturer's recommendation with the spa and see what happens. (I hope we are not sanding off the gel coat!) I'm not getting my hopes up, after all, I scrubbed yesterday with no success.


If this is what we may have to end up doing to the pool IF IT WORKS in the spa, my question is now: how in the world can we sand/buff a 20,000 FB pool? How will we drain water from a fiberglass pool with no drain hole at the bottom? AND isn't it dangerous to empty a FG pool? I know it can be done, but I am sure there are several precautions to take. (I am ranting.)

Awaiting your input. Thanks bunches!