Always rinse filter media before use to remove excess dust. Black Diamond crackles and gets warm as it is being rinsed. This is normal, letting you know it's ready to go to work.
Use 8 tablespoons per 10 gallons of aquarium water.
Place in media bag or media basket and rinse thoroughly in cold water to eliminate dust particles.
Replace every 2 - 3 weeks (sooner if foul smells or water discoloration occur).
Note: Replacement frequency depends on fish population, waste loads, and water hardness.