
The bags themselves are great but I wouldn't use them for anything smaller than biocarriers as the holes aren't very fine and won't trap smaller particles. I use it to hold Seachem Matrix and it works very well with the Aquaclear 20 filter it was designed for. I like 2 packs as I can now store reserve biocarriers in case I need to use new tanks quickly! If you need a bag for fine media like fine activated carbon or some Seachem chemical filter media like purigen or denitrate, I would buy a Seachem "bag".

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