45g Fluval CO2 Refill Cartridges are a great way to keep your planted aquarium healthy and thriving. By adding carbon dioxide to the water, you help to create an environment that is more conducive to plant growth. These cartridges make it easy and convenient to replenish your aquarium’s CO2 levels, and they are available in a variety of sizes to suit your needs.
5/8″ Thread. Compatible with Fluval aquarium systems