Is this for use in eliminating bubbles such as from a skimmer etc. If so, and its to be installed on the outflow tube of a skimmer the prefilter sponge filters sold for useon Powerheads adn submersible pumps like the Mag Drives all work fine. I use the sleeves thats used onthe mag drives on all my super skimmers and they work perfect.......I find natural sponge rots quicker than synthetic sponges do. It would be nice to know intended use of said sponge, so a more suitable suggestion may be given.