E.L. Foust trays are filled with your choice of carbon and are to be changed around every six-nine months. If you wish to order a special media, please list what kind in the comment area when you check out.
They are filled with granulated carbon from 6-9 pounds, depending on media choice. The 8 lb.STD mix carbon is the longest lasting and removes the widest variety of chemicals, fumes, odors, & gases.