OK just alittle follow up.

Pool is nice and clear. Got the new chlorine kit so I can test for CC better. Also more cynaric acid.

FC 4
CC .5 ( well the solution barely turned pink with 5 drops R3. One drop R 871 to turn clear. testing from 10 ml mark)
PH 7.2 ( Never changes. )
Alk 90
CH 17.1 ( Actually my test is for total hardness. Should I have calcium on a vinyl liner? I fill from a softner and it removes all that.
CYA 30

The pink stuff worked as Ben said. The liner is clean of the stains. It also cleaned the pump basket. It looks new. I never knew it was stained. The return is white also...LOL

Now I am wondering if and when to shock if needed. Because of $$ I am not buying any more metal stuff unless I have to. I think my staining was caused by over chloronating. I have the same well water as before but because of my issue this yr, I probably raised my chlorine to some ridiculous amount. 25-30ppm???

Now with the powder test I can shock properly and keep the correct levels.

Not sure if the pool has that depth it used to have. You know, water so clear you can read the date on a quarter at the bottom... Well not really.. Just trying to explain what I mean.

Anyway I am going to find info on when to shock. I think I read people do it once a week regardless, but also read only when CC gets to a 1.

OK I will take pics tomorrow. Its going to be 90F