Ok so the pool looks awesome.... except for the one line/stain that I think is algae. I am still maintaining SLAM. Brushing at least twice a day but this seems like one stubborn stain. I posted a couple of pics trying to show the stain. it’s hard to see in the photos so I circled it. Is it possible this is something other than algae? I also added one pic so y’all can see how beautiful the pool sparkles now.