The bio bag is what I have (I think) it fits in the frame perfectly and has the charcoal inside it, sounds like we have the same filter. I bought the 3 pack when I bought the replacement bags. Ok the box just say's filter cartridges, fully assembled, for 10-20, 20-40i,10-20, 20-40, and 30-60 Power filters. I don't want my filter to leak so maybe I should stick to that instead of switching to the foam thing. I just want my fish to be as healthy and comfortable as I can make it for them.