Green organic stain for over a month on vinyl liner

[Rockstead]

I closed my pool for the first year without a leaf mesh net.

Startup went fine, but I opened very early in the season, I think I shocked with leaves still in it and I was left with a green stain. It has gotten a little thinner but nothing I do will get rid of it, shocking didn't help, maintaining high chlorine didn't help, I rubbed on Orange on it and nothing, magic eraser.

Not sure what to try next.‎

 

[basod]

CYA puck placed on the stain for 3-5mins.
If it doesn't budge could be somebody dropped an penny in there and you have a copper stain.
Use some Vitamin C pills in a sock and rub the area.

Some recommend going the VitC route first as the CYA puck is acidic as well and may indicate false inorganic stains

 

[Rockstead]

I've never had much luck with the vitamin C, is there a pool store product that contains the Vitamin C type properties that I can just add to the pool to remove the stain?

 

[basod]

Vitamin C is Ascorbic Acid. You can buy it in bulk online and pool stores. But why throw something in the pool without first diagnosing the nature of the stain?

 

[Rockstead]

The pool store recommended putting PH down in a sock and attaching it to a pole to rub on the spot to remove it, is this good advice?

 

[basod]

pH down is a dry acid and should work to lighten the stain if it is truly copper.

 

[Rockstead]

pH down is a dry acid and should work to lighten the stain if it is truly copper.

It was from a pile of leaves, there is copper in leaves?

 

[basod]

It was from a pile of leaves, there is copper in leaves?

I was reading from above posts where I mentioned there was a possibility a penny may have been thrown in the pool.
No there is no measurable trace minerals in organic debris to cause a metal type stain.

Dry acids can work on organic stains but you're likely to see better results from a tri-chlor puck or raising FC in the pool for a while - neither of these tests have worked for you?

 

[Rockstead]

I was reading from above posts where I mentioned there was a possibility a penny may have been thrown in the pool.
No there is no measurable trace minerals in organic debris to cause a metal type stain.

Dry acids can work on organic stains but you're likely to see better results from a tri-chlor puck or raising FC in the pool for a while - neither of these tests have worked for you?

Definitely no penny.

While the temperature was still cold in the season and not much sun, I hadn't realized the chlorinator was set to 100% for an easy 2 weeks. So my FC was easily in the 15-18 range and it didn't help much, although the green stain lightened a little.

 

[basod]

Dry acid on a vinyl liner is a bad idea - you run the risk of bubbling the liner which is a lot worse than a green stain.

I know you said the Vitamin C hasn't worked for you in the past but have you even tried it on this stain?