discolored pipe in generator system

[poolbee]

Thanks. I'll try today.

Tried it but didn't do much. I saw another post while searching info on this. In it, Sean, you mention it you could see inside the PVC pipes they should be white. When I did my purge of the regulator, I noticed the PVC was very yellow, almost brown. I could scrape it off with my fingernail though, and it is white under that. Could that still be from all the dirt we had around(my Dolphin is still picking up tons of polymaric sand 3 weeks after the patio is finished) or could I be looking at an algae problem? The top 2 stairs are yellowish but that comes off easily with a Magic eraser and it is not slimy. Pool water is crystal clear, as well as pool walls.

At first I thought of copper corrosion, but I'm thinking the yellowing would not scrape off it it was. I check my pH every other day and have only once lowered it too much, but added borax right away to increase it and that was quite a while ago.