Removes odor, discoloration and impurities to keep water crystal clear. Phosphate free. Safe for both freshwater and saltwater tanks. Works fast and lasts. Main Technical Specification: Type Diameter (mm) Iodine Absorption (mg/g) Ash Content (%) Moisture Content (%) Bulk Density (g/l) Hardness (%) CTC Absorption(%) Methylene blue (mg/g) ZJ Ø0.9 Ø1.5 Ø3.0 Ø4.…