I've been using my Whisper Biofilter for years now and these packs are great for it. Can be washed and reused a few times before replacement is required. I can dump the old charcoal and just put some fresh charcoal (from a spare canister) in the old filter and let it work. After a few times I put in fresh filters. The filters are very durable and filter out the "health" in the water very well.
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