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it doesn't matter if they are not made for you filter. Fluval also makes just plain blocks of filter sponge. You can get a box for under $10. Just cut a piece and wrap it around the intake and then use rubber bands to secure it. You may have to cut the thickness of the sponge down so the sponge is thinner.
 

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you didn't read my posts. the sponge i posted ISN'T a circular sponge. Its literally a rectangle shape

http://www.thatpetplace.com/foam-block-fluval-404-405-2pk

you cut a piece and the wrap it.

it is not a cylinder and it will work on the whisper.

You maybe need to cut the thickness of the sponge down but that is super easy to do.

please don't jump to conclusions. I've used this sponge a tons of different filters.
 

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I never posted a link of circular sponges. that was someone else. again read who posts what.

I wouldn't use kitchen sponges because they are dyed and the dye can be harmful to the tank.

you should only use things in your aquarium that are intended for aquarium use. the box of filter sponge is $5. its super cheap.
 
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