Chemi-Pure is the original Ion Filter Medium constantly improved over the years.Promotes aerobic bacterial growth and nitrification, while removing dissolved organics.- Promotes ravenous appetite and increased life span in fish.- Eliminates fish loss due to unbalanced or polluted water, acidity, and pH changes- Necessary organisms allow growth with no danger of pollution- Removes copper, metal, ions, odors, all pollution, gasses, CO2, color Phenol.