Can you bleach a sea sponge? If I spent the money on one, I'd want to use it over. I bought a cheap pack of sponges at the dollar store, and cut them into 1 - 2" strips and they worked great in my small home made incubator. I wired a pudding cup to the wire upright section that keeps the chicks away from the electronic stuff, stood the sponge (s) in the cup, and added water as needed with a syringe hooked to a piece of aquarium air line tubing. If you get the cheap ones, there's a cellulose one that wicks well, and then a plastic one that's more shiny that doesn't wick well at all.