Thank you for everyone's green pool problem. I'm finally getting good readings on my chemistry. Now I have another problem, but was not sure whether I should start a new thread since it is a separate problem or continue on the old one. If I was suppose to continue on the old one, I apologize and could the Mod kindly merge this with "trying to restore green pool" thread.
Well I see weird discoloration on the walls and the steps of my pool as you can see in 1.jpg attached. Is this something that can be corrected by treating the water or is it something what will have to be repainted?
Second minor question is, what is that pipe sticking up from the middle of my cartridge filter in 2.jpg?