Quote Originally Posted by robbym70 View Post
My set up is totally different than yours but when I need to scrub the walls of my vinyl pool I use a stiff nylon brush. I thought maybe switching to a stiff nylon brush might be a good alternative for you if you think the wire brush is damaging the surface of your IG pool. Couldn't hurt trying it out.
I am having a tough time removing the black algae spots even with the wire brush. I think black algae may not stick to vinyl surface as it would to a gunite surface? I have scrubbed the walls everyday for three weeks continuously while maintaining a +shock+ level of FC, I got so tired, but still there are algae spots. I think there is has to be an easy way to remove them without draining and acid wash, but I just dont know what that is. Its almost gone, and is much better now, but I would like to remove the remaining patches somehow which does not come off even with a wirbrush. I was going to try some strong algecide as my next plan.