The Korallin S-3002 comes with about 12 pounds of sulfur media. The instructions recommend that you fill the reaction chamber about 50% full with sulfur and then 2-3" of the coral-skeleton media, leaving 3" between the top of the media and top of the reaction chamber. You can view the instructions on our website, here: http://www.f3images.com/IMD/UserManuals/KL9113K .pdf.