I do not have pics, but found these from another post that could have been taken at my pool. Here is the link, I hope it works!
Anyway, dirt colored stains that showed up over night - literally -
We are thinking the only solution is drain and acid wash - is that correct?
We were told to do a 3-1 ratio for the wash - but are wondering if there is anything other than MA that we could use.
Any direction - advice?