the bio wheel is supposed to create a good environment for the good bacteria that your tank needs to cycle. Most filters like my old whisper only have bio bags which are cloth bags with carbon in them and this is the only thing that holds the bacteria so when you have to change them which is sugested once a month you loose allot of bacteria. With the bio wheels you never have to change them so you keep allot more. Also the penguin has an extra slot so you can add other things to your filter. I personally have the two Bio Bag type things that came with it and some pete moss in a bag and a carbon infused pad plus the two bio wheels.
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