Quote Originally Posted by rbabin View Post
I installed a fiberglass pool 2 years ago and noticed all the flat rough surfaces appeared to be fading. I was then told by the pool installer that it was a calcium buildup and it could be scrubbed off.
Are you familiar with the acronym, "CYA", as in Cover Your A##? It looks to me like that's what the installer is doing, here.

Quick test: get some muriatic acid or sodium bisulfate (pH Down). Mix up a cup of 1/3 acid + 2/3 water. Pour it on the step.

If it fizzes, it's calcium carbonate. Rinse it off after 5 minutes. If there's no change, and no fizzing, take good photos, and check your pool warranty details.

Good luck!