Pale yellow pool coping shows lots of dark spots when it becomes wet.
I've tried scrubbing withbchlorine andnmuriatic acid, nothing seems to touch it. Not even a pressure washer. Pool is in the sun almost all day, I can't image how it got stained so bad if it's some sort of algae with as much UV as it gets. It's not all the coping, more around the spill over spa. Pool is four years old. You can clearly see the change when it becomes wet vs. dry. Any ideas?
I've tried scrubbing withbchlorine andnmuriatic acid, nothing seems to touch it. Not even a pressure washer. Pool is in the sun almost all day, I can't image how it got stained so bad if it's some sort of algae with as much UV as it gets. It's not all the coping, more around the spill over spa. Pool is four years old. You can clearly see the change when it becomes wet vs. dry. Any ideas?
