Ed,
The only sure way is to do a water change. You probably would have to do only a partial which would remove some of the copper. Have you tested your water for copper? It would be a good idea to find out how much is there. I bought Ben's Copper test kit (PS-251) year before last for about $25. Used it twice, once on my pool to see if staining was coming from copper (tested 0 ppb) and once to help a friend out with an AG pool. It tested high so we drained half the water. No more staining/green hair! You may want to try the "metal removers" (unless you have a cartridge filter) but remember to follow the directions and backwash/change DE imediately after. I'm not even sure they will work on copper but $15 is probably cheaper than half your water....