Started cleaning my pool a couple weeks ago to open it for the summer. Once I got the water cleared up I found what appears to be dark brown or black stains at the bottom of my fiberglass pool. Full disclosure, the water did get pretty dirty during the spring. I've scrubbed/brushed with no success. Last summer we noticed a little scale build up in our pool, and wonder if the stains are scale that is discolored. I reduced my pH to 6.8 and brushed but was unable to lift the stains. I'm doing a SLAM at the moment in case its some sort of algae.
Thoughts or suggestions?
Thoughts or suggestions?