30 pound bag of catalytic carbon. Enough for 32 of our 10" refillable cartridges! Size is approximately one cubic foot and it is delivered in 8 x 3.75 pound, double ziplocked, heavy duty bags. Has regenerative effects and is used in well water applications. When you need to get out heavy chlorine in your water or if your city uses Chloramines to treat your water, we offer this media at a huge discount!