Marina T100 Replacement Aquarium Filter Cartridges are for use with all Marina 3.7 L (1 US Gal.) aquariums, including the Marina Pirate Aquarium Kit and the Marina Mermaid Aquarium Kit. Marina Replacement Aquarium Filter Cartridges remove pollutants and odors, and improve water clarity and color.
Key Features :

For use with all Marina 3.7 L (1 US Gal) Aquarium, including Marina Pirate Aquarium Kit (13310) and Marina Mermaid Aquarium Kit (13311).
Improves water clarity and color.
Removes pollutants and odors.,