Anthracite Filter Media is thoroughly selected from anthracite which yields the highest percentage of carbon. It is then hydraulically classified to reduce mineral matter and ash to a minimum, and finally screened and washed to ensure suitability for filtration purposes. Typical Physical and Chemical Analysis Carbon Content: 96% Specific Gravity: 1.6Avg Fracture: Angular Solubility in Alkaline Waters: None Density : 52Lbs./Ft3 Solubility in Acid Waters: None Hardness (Moh's Scale): 3.0 - 3.5 Solubility in Hydrochloric Acid: <0.2% Visibly free of clay, shale and extraneous dirt Basic Sizes Part Number Size Effective Size A0100 #1 .60 - .80 MM A0112 #1 1/2 .85 - .95 MM A0134 #1 3/4 1.10 - 1.20 MM A0200 #2 3/32" x 3/16" (2.38 x 4.76 MM) A0300 #3 3/16" x 5/16" (4.76 x 7.95 MM) A0400 #4 5/16" x 9/16" (7.94 x 14.29 MM) A0500 #5 9/16" x 13/16" (14.29 x 20.64 MM) A0600 #6 1-3/16" x 1-5/8" (20.64 x 41.28 MM) Our Factory is construct under CJ/T43-2005(China); JWWA-A-103(Japan); AWWWA-B100(USA) stander, our product are well known as it’s equality size, less in lost, great in adsorption.