Carbon Block Filter Cartridge for Residential, Commercial, Industrial Use Specification : Filtration : Nominal Rating. Micron Rating : 5um Length : 9 3/4", 9 7/8", 10" (Most Common for Residential) , 20" (Most Common For Commercial), 30", 40" (Most Common For Industrial) ID (Inner Diameter) : 28mm OD (Outer Diameter) : 65mm Material : Coconut Shell Activated Carbon Iodine 1000 with FDA Compliance polymer Bonding Outer Finish : Standard Products Equivalent : DEWater PP Indonesian Top Brand Packaging : Wrapped with POF Plastic Material. 10", 20" : 25pcs/Ctn 30", 40" : 20pcs/Ctn Container 20GP / 40GP / 40HQ Ordering Code : CTO-AA AA : Inch