Post return line repairs: Small spots on liner

[nalesean]

I'm still working on this.

I verified the vitamin C test didn't work.

I have purchased the Iron out, but haven't had time to apply it as instructed.

Will update after that.

Thanks!

[PoolDoc]

OK.

I just reread the thread -- it's possible for concrete to fall through the water and stick tightly to a liner. But, it won't usually be black. Just thought I should mention that.