Hagen Marina T-100 Replacement Filter Cartridge for all Marina 1 Gallon Aquariums - 3 Pack

Marina T100 Replacement Filter Cartridges (3-pack) – A pack of three filter cartridges for the Marina “Top Filter” units commonly used in Marina’s small 1–3 gallon aquariums (like the pirate or mermaid themed kits). Each cartridge has a foam and activated carbon insert that traps debris and removes odors or discoloration from the water. They are very easy to swap out – just slide the old cartridge out and rinse and insert a new one. Regularly replacing the cartridges (about every 4 weeks) keeps those tiny aquariums clean and clear for your fish. This 3-pack ensures you have spares on hand to maintain ideal water quality in your mini tank.