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Whether they have carbon in them or not I can't say as it's "impregnated". However they are the size stated, which is perfect to fit under the outlet drip pipe from my tank into the sump underneath. Fine enough to let the water flow through easily but coarse enough to catch any plant matter that has been sucked into the sump system. I'm happy with my purchase and will buy again.
Verified purchase: Yes | Condition: New
They are black and square and look the part. I haven't tried them yet but hope to in the near future.
Verified purchase: Yes | Condition: New