From my limited experience it really looks like what I've read on threads where the pool has ammonia. It just takes a whole lot of chlorine to get rid of it. I've seen it recommended to test as often as every 30 min when the CCs are high from ammonia. Eventually the CCs will drop from those crazy high levels. An ammonia test would help you to see your progress as far as that's concerned but the "prescription" is...more bleach! ;-)