White Film on Blue Fiberglass Steps

[jewing]

Can someone help me determine how to remove a white film from my blue fiberglass steps. My pool water got low and the water evaporated from the top step today. When I got home there was a white film (or stain) or maybe even fading of my top step. I tried to clean it with a Mr. Clean Eraser, Bar Keeper Friend, and even an SOS pad. Nothing touched it. It won't come off. I am worried it is faded. The rest of my pool is sparkling. Any ideas?

FC 10 ( a little high due to finishing up a shock after a big pool party)
PH 8.0 ( high too - was waiting on the FC to come down to accurately test)
TA 100
CH 180
CYA 70

 

[jblizzle]

Does it feel rough at all? ... like is it calcium deposits from water continually evaporating.

You could try a dilluted solution of muriatic acid and scrubbing ... although I am not too sure how much risk that puts on the fiberglass.

 

[jewing]

Thanks. I filled my pool back up to cover the step and the white went away. So as long as it doesn't show up when it is covered with water I am fine with it.