Would a clean, unused kitchen sponge work in place of the store bought white pouch w/ carbon filling inside of my hob filter? I would have to cut the sponge in half so which side would work better, the scrubby side or the soft side? I figure it would last longer than the thin white pouches that are made for the filter. I'm hoping to eliminate the activated carbon from my filter. Of course, if I choose to do this, I would float the cut sponge in the tank for a few weeks before removing my current filter media.