When there is iron in the water and it is introduced to high chlorine levels, it will precipitate out, which is what turned your water brown. Some people cope with it by adding Metal Out or other metal sequestrants (they don't really remove the metals, they just keep them in suspension) and keep their CYA low so their chlorine can stay low, or lately we've had some people that intentionally superchlorinate their water before running it into a filter of some kind, to cause the metals to drop out onto the filter before going into the pool.
Go through and read as many of the posts in the "metals" section of the forum as you can, especially any post written by Pooldoc or Mbar, and that should give you an idea of what's necessary in a pool with iron in the water. If you can't see it while logged in, you may have to log out to read them, then come back and post other questions if you have them. There are many people in your shoes, particularly this summer, for some reason--but the best you can do right now is either filter out the metal before introducing it to the pool, or use sequestrant and keep the chlorine and pH on the low side.
Janet
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