Was not sure where to post this so I'm trying this forum. I have a crystal clear pool that mid summer every year I start developing recurring grey patches. These occur in shallow end only and will not remove with scrubbing. In the past when I have super shocked they disappear. I now have SWG and FC is 6 and they persist. All my chemistry is perfect.
Ph 7.4
Alk 60
Cya 60
Temp 87
FC 6
Any thoughts, suggestions?
Ph 7.4
Alk 60
Cya 60
Temp 87
FC 6
Any thoughts, suggestions?