Sorry to hear about the puffer
Copper is very difficult to remove completey. You can try setting it up and using a polyfilter
. It claims to remove copper. You can tell by the color it turns.
"Poly Filter turns color when removing medications (Blue with copper, Red with iron, Green with ammonia, etc.). "
I always have one in my sump and replace it every 30 days. Mine always turn brown (good sign).