Getting ready to SLAM and then M.A. SLAM.
Pool is clear, all my readings are good. Overnight chlorine loss was good for 2 nights in a row, yet I still get yellow on my walls if I don't brush the sides at least every other day. Trying to figure out where my algae problem is residing and I think I've found the culprit.
If you look at the attached, it's the bottom of one of my 3 skimmers. Nasty. All 3 look like this. And the brown goes down into the pipe as well.
I'm guessing a combination of algae and other slime? Hard to get off, that's for sure. You can see where I've been working at it. Trying my best to clean it all, then start slamming.
I'm pretty sure the previous homeowner NEVER cleaned these.