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It's filter floss. It's used with HOB's also. That's the only media I use. You can get a bag of it at your lfs for about $1.50 and it should last a few years. I rinse mine each week but only replace it twice a year or so.tempestuousfury said:What is floss? So far, I've been able to decipher that it is used w/ canister filters. That's about it.