I have been tourmented by problems with my pool since the start of the year. What I thought to be a metal problem is not. The metal reading is zero for copper and zero for iron. The brown water will disapear with a metal/stain remover but does not solve the problem completely, it will be back in about three days. I have had a pool for a long time. I have never seen anything like this. I am my pool store’s “poster child” and am currently receiving free chemicals, since I have dumped in about fivehundred in one month. The people at the pool store do not know what it is, or what to do. The chemicals I have already used are::: Metal removers, algecides, shock, clarifier’s, flocc., filter aid, flocc and vac., I think that’s just about it. Oh, and I changed my sand this past weekend. I need to get rid of the brown. All of my readings are within good range, all now, but ph, just rained alot, getting that back up. Thanks in advance to any and all help!