This has been brought up on the previous page and you will see my quoted response from Drs. F/S.
The only canister on the table which is not sold with media is the "Eheim Large Canister" (as stated by Drs F/S).
The above quote was stated earlier in this thread and is an exact copy from the Drs F/S website.
Just about any type of filter media can harbor a bacterial colony.
Hence each of these canisters can provide "low to moderate" bio filtration.
My point is: The consumer should be educated about filtration types and not blindly follow tables such as these.
