Compressed Cellulose Sponges

Compressed cellulose sponges are sometimes called pop-up sponges. These sponges are dry and have all of the air sucked out of them prior to packaging. The sponge "re-hydrates" when you place it in water, popping up into a normal cellulose sponge. Compressed cellulose sponges can be attractive to some buyers because they are not usually treated with soap or biocide substances. Compressed cellulose sponges are more expensive than other sponges.