I don't mean to barge in, but what they are telling you is correct. if your levels go out of wack. you will be back to square 1. I was having this issue since may. Tried metal out, but what my pool store wasn't telling me was to keep my levels balanced. I did find a product to clear my brown water since i have a small cartridge filter with my 5,000gal intex pool that doesn't do much. It's called pool stain treat. it's a sequestrant and chelator. Don't ask me what that means, but after 2 days of using this my water cleared,and the cartridge filter actually caught all the brown(washed it out 4 times). I bought this product on my own as a last resort before I took down the pool. Called the company that makes it(united chemical corp.) And just like the above posts the company told me that even with this, if my levels are off, bam, back to brown water. They said for this chemical to work you levels have to be balanced. This site is the best one that I have found out there. Thank you and keep up the good work.