Stains/Debris in fiberglass?

[aceniza]

Over the winter a breaker tripped and our pump didn't run for an extended amount of time. Needless to say it was an absolute swamp, and took a lot of work to get cleaned and balanced.

Since then, what looks like dead/bleached algae, won't come off a lot of our surfaces.
This is only affecting the flat/horizontal textured surfaces - which should rule out bleaching, granules (I don't use any), etc.
It literally looks like sand or dead algae, except when I brush it, it doesn't come off.

I have not yet gone in and tried aggressively brushing with a stiff brush.

My water has been balanced / within spec since May.
FC: 5.8
CC: 0
pH: 7.6
TA: 80
CYA: 70
CH: 440
Salt: 3400ish

 

[PoolStored]

Hard to tell from the picture, have you felt it? Does it feel raised? Almost looks like gelcoat failure...

 

[ajw22]

Could be Calcium Scale - Further Reading from high pH while the water was still while the pump was dead.

 

[aceniza]

Hard to tell from the picture, have you felt it? Does it feel raised? Almost looks like gelcoat failure...

I haven't actually tried feeling it... but I imagine if it was a gelcoat failure, it would be slowly growing and flaking off?
Otherwise doesn't feel like anything under my feet.

 

[PoolStored]

Try feeling it to see if it is raised...try scraping some off with your fingernail.

 

[aceniza]

Could be Calcium Scale - Further Reading from high pH while the water was still while the pump was dead.

would that persist after everything is balanced?

 

[ajw22]

would that persist after everything is balanced?

Yes