Rob, I have never owned this filter brand though I do see a lot of comments on fish forums about the bypass 'issue'. What some people have done is add some filter batting, not filter floss, either around the outside of the bottom tray held in place by fishing line or around the gap between the top tray and the filter housing.
I wouldn't use filter floss as there is the potential to have loose strands possibly get caught in the impeller. Try using Poly-fil brand Traditional Batting from a craft or sewing store. I've used the latter as a fine media pad in my canister and power filters without any issues.
I wouldn't use filter floss as there is the potential to have loose strands possibly get caught in the impeller. Try using Poly-fil brand Traditional Batting from a craft or sewing store. I've used the latter as a fine media pad in my canister and power filters without any issues.