Hi NPG;

When you have iron in your water, turning brown is what it has to do before you can get it out. Brown iron is the filterable form!

What you could do is drain, refill, and add polyquat as you fill to prevent algae, etc. Then gradually chlorinate with calcium hypochlorite added to the skimmer (I can't remember, do you have a skimmer?) in small doses.

This while STILL cause it to turn brown, but hopefully, you can filter it out as it does.

If not, the other option is to chlorinate, let it all turn nice and brown, then turn the pump off and let it settle. Then, siphon vacuum it off the bottom and out of the pool. Of course, you'll have to refill some after you do, but you might be able to fill to flooding if you are planning to do this, and then vacuum down to normal levels.

Ben
"PoolDoc"