Aqua Clear 20 Nylon Bags, 2 Bags Each 6 Bags Total(3 Packs with 2 Bags per Pack) AquaClear 20 Nylon Bags Fine mesh holds small grained filter media Helps keep aquarium clean and clear For use in fresh and saltwater aquariums Suitable for the AquaClear 20 Power Filter; 5-20 gallon aquariums