All of Granulated Activated Carbon (GAC) Systems are filled with finest Coconut Shell Carbon on the market today. Our Carbon does carry the NSF Certification and are designed for the removal of Chlorine, Pesticides Odors and other Chemicals that maybe in your water . When you want the very best for your plants, 420 Water Products's Carbon Systems deliver. Combined with the 420 Reverse Osmosis System, you have the confidence and control over your Product water. If you need help with sizing your system, call us anytime.