Heidi,
Dealt with well-water filled pools before and dealing with it now. Believe me they can help you get crystal water here if you do what they say. I did notice that you said that you are changing the filter. You can re-use the cartridge filters MANY times (one filter will usually clean the iron from a pool your size) by rinsing it out at the very least, 4 times a day. This will also help to filter out the metals that are causing the problem. If you can rinse the filter every 4 hours, even better. The metal will rinse out of it. I am on the third day now of rinsing my 10,000 gal 22'x52" Intex pool filter cartridge and every day the pool is looking better. But I am only dealing with iron which the cartridge filters tend to catch easier. This is the only method I use and I have successfully filled my last 15'x42" pool with well-water every year and had it clear up in a week, but all in all ... our northern Indiana well-water is not bad except for the iron.

Let us know how you are doing out there.

Tami