Newstone Premium Activated Carbon - Made in Japan, Deodorization, Air Purification , Water Purification Granular activated carbon : coconut shell shape : crushed particle size : 2.36 ~ 0.50mm (8 ~ 30 #) Adsorption performance : iodine 1,030mg / g (activated carbon 1g equivalent) , methylene blue 180ml / g (activated carbon 1g equivalent), pH6.0 (domestic tap water standard pH5.8-8.6) domestic products * pH is adjusted , purification performance is very good.