We recently just had a Latham fiberglass pool installed the last few weeks. When the concrete crew was pouring the coping, they were pretty sloppy and left a generous amount of concrete to cure on the floor of our pool. I hadnt noticed it because it was covered with a bunch of construction debris. we had our pool cleaned out and opened up by the pool company, but this stain was left behind. I think it is just cured concrete and probably needs more thorough scrubbing but perhaps a chemical cleaner will help this process along. Any experience on this forum with such a problem?
Yeah, the concrete guys left all kinds of streaks down the sides of ours. You can experiment with easiest to more aggressive like: Magic Eraser, Kitchen scrub pad, 1,000 grit wet/dry sandpaper, 800 grit, etc. You can go with a stronger grit sandpaper, but no lower than 400 and be mindful it may leave very fine hairline sand marks. You probably won't see them underwater anyway, just be aware.