Originally Posted by fijiwigi
...Absorbstion of Nitrates and ammonia I believe what else does it accomplish???
Melosu's comments and links pretty much cover it. But I just wanted to add that GAC
or Purigen really won't take out nitrates or ammonia itself. They will reduce the organics that will eventually turn into nitrates and ammonia though. Maybe it's just semantics, but don't expect to put GAC
in a tank full of nitrates and expect the nitrates to go away.