I saw a thread where a guy used a lot of house sponges in his sump. I dont have it bookmarked but If I come across the thread I'll post it up and maybe you can ask him what he did if anything before using them.
you can buy natural sponges that are used for household chores that are ok for aquarium use, they usually dont have that pretty square cut look, but work great for filter media, and house tons of bio, if used in a sump, or overflo box on a HOB filter, plus they just rinse out and eliminate the need for buying those expensive filter pads with the useless carbon in them.
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