I was looking for a small pouch that would hold some filter material that would fit into the narrow core of my AquaClear detachable head filter. They work great. I can put two in each section in the filter or mix them. I just put a tablespoon of anything - like Denitrifier or Polysorb etc - in a bag, tie it in a knot, cut off the ends and stick it in the filter. They stay intact, don't cause fish problems or chemical problems etc. Perfect solution for nano filter media or in narrow filters like mine. Just throw them away when you need to replace them.
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