I am having similar issues with metals. My FG pool was stained upon opening and I used the Ascorbic acid treatment (followed by Metal Magic) which removed every sigle stain. But, when Cl was raised accidentally, stains came back w/a vengeance and 60% of the pool was covered! Used Metal Magic again, which unbelievably cleared the entire pool. I was impressed. But, stains started forming again just 3 days later, despite a lower cl and lower ph. I'm scratching my head.

I'm in the process now of figuring out what works. Marie and Waterbear suggested some Calcium in the pool, which I did. Marie was also using Metal Out from Waterwarehouse, which I bought.

I've been using Extra Strength Metal Out for a few days now and it has not removed the stains - it lightened some stains but did not remove them. So, for the stains that I have, I think the Metal Magic works better. I'm out of the stuff right now and have ordered more this week. Pool is stained right now - I'd say 20%.

I also had some stain problems last year, but not as bad as this. I probaly used about 3-4 quarts of Metal Magic all season. Again, the Metal Magic is clearing the pool - but I don't want to be burning through a quart of this stuff every week! My CYA was 30 and I am in process of bringing it up to 50. The CYA level is is the only difference really from how I kept the pool last year.

I'd love to be able to have a stain-free pool and use a weekly maintenance dose, but I really find I have to use a lot of product to get rid of the stains.

Perhaps running at a higher CYA and a higher Cl, it will help. My ph is pretty consistent at 7.2. I know higher Cl has been stated to bring stains out, but perhaps with CYA, maybe less so. I only say this from my experience last year.