Granulated Carbon Size: average 5 mm (0.20 inch). Work as multipurpose chemical filter media that removes toxic compounds and medications. Phosphate-free premier activated carbon is safe for both freshwater, saltwater, and pond environments. Performs up to 3X more efficiently than other activated carbon. Ready-to-use media bag, convenient for use with your canister filter, power filter, or pond filter. Removes odors, discoloration, and impurities to keep water crystal clear. 100% natural walnut shell carbon will not raise phosphate levels. ****As with all carbon media, always rinse well to remove excess dust till the water runs clear before use. **Friendly reminder: Carbon is bagged in mesh bags and enclosed in plastic bag. Package includes: 1 bag of 5 lbs premium activated carbon (total of 5 lbs) in 1 piece of black mesh bag, size: 11.0" x 13.0" approx. Bagged for easy handling and precise placement of carbon, and to ensure carbon media particles not traveling through pumps and pipes. Zipper-designed mesh bag is reusable. The zipper is made of plastic, and it's safe for freshwater and saltwater use. 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 activated carbon granular 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. Eliminates odors, discoloration and dissolved organic wastes from aquarium water.