ATI Carbon PlusATI Carbon Plus is a highly effective and scientifically formulated activated carbon that produces crystal clear water in both freshwater and saltwater aquariums. The optimised pore structure and huge number of capillaries produce a large internal surface area of 900 1000 m2 g, which is capable of quickly and efficiently removing harmful substances from the water. Further information can be found on ATI's website: Click here See our Return & Refund