using citric acid stains not gone

[PoolDoc]

I'd recommend trying stuff BEFORE you dump a bunch into the pool.

Do this:

1. Put a vitamin C tab against a stained area, and leave it till it's mostly dissolve.
2. Buy a small container of "Iron Out". Put 1/4 cup in a sandwich baggie. Open it onto another stained spot, and then set a wet towel down on it, to hold it in place.
3. Take a chlorine tab (if you've got one) or a sandwich baggie of chlorine powder, and put it on ANOTHER spot. Do NOT leave it longer than 15 minutes, before your remove it, or brush it off.

See if any of these change the stains. Tell us what you find. Do NOT try to add stuff, till you've tested -- NONE of those things (ascorbic acid, sodium hydrosulfite or chlorine) are compatible with each other. Citric acid may work if ascorbic acid works, but try the ascorbic acid (Vitamin C) first.

[ryanbc01]

What do the 3 different treatments show you? So if the chlorine tablet works but not others what does that mean? Same for other 2 options.

Thanks,
Ryan

[PoolDoc]

Vitamin C (ascorbic acid) and Iron Out (sodium hydrosulfite) can both re-dissolve some metal stains, for example converting iron oxide (rust!) to soluble iron (Fe++).

Some stains are organic in nature, and unlikely to be affected by Vit. C or Iron Out, but are likely to be bleached by high chlorine levels.