Granular Activated Carbon (GAC) is a highly effective water treatment medium used in saltwater aquariums to remove organic compounds, medications, pollutants, and other chemicals from the water. This process not only clarifies the water but also improves the overall health of the tank's inhabitants by maintaining optimal water quality. The ME GAC carbon features large particle sizes which reduce dust during use and provide larger pores for better pollutant removal capabilities. Each bag contains 250 grams, providing enough to treat up to a 100-gallon aquarium when used at recommended levels.