Granulated Activated Carbon Size: (Approx): 3 to 5 mm / 0.20 inch average. Phosphate-free premier activated carbon is safe for both freshwater, saltwater, and pond environments. Eliminates odors, discoloration and dissolved organic wastes from aquarium water. 100% natural walnut shell carbon will not raise phosphate levels. Package includes: 5 bags of 1 lb each premium activated carbon (total of 5 lbs). Including 5 pieces Black mesh bag, size: 8.0" x 6.0" Perfect small granules to help eliminate cat litter smells. Please note: Always rinse carbon filter media until water runs clear before use to remove excess carbon dust. Each granulated activated carbon size may vary slightly due to the nature of the product. Work as multipurpose chemical filter media that removes toxic compounds and medications. Works longer comparing to average activated carbon. Performs up to 3X more efficiently than other activated carbon.