Answer: Aquadynamite can sell beads by the pound. $2.00 per pound.
BEWARE: That idea, (mixed-type-media) is an older idea which sent a whole line of bead filters to their failure. The outcome was not very happy. The Pr_____tor was designed with about five medias, of varying sizes and weights. The idea was to achieve a denser "percolator" for superior mechanical filtration. Conceptually, a very good thought. What the public eventually got was a cake of aggreggate in their filters. With ANY bead filter on the market, there *has* to be just-enough space between the media-particles for air (or water) to fracture the bead-cake if (and when) it "sets" up.
