He flu also CO2 canisters are part of the simple carbon dioxide delivery system Fluval sells. These canisters have a few days worth of CO2- depending on bubbles per second of use for your aquarium plants.
The system is easy to use and does the job for small tanks that need a part time or easy system.

They are not super economical for long term use or larger tanks as the usage would be high. They are fantastic for supplemental use or short term or as a back up device.

My only complaint is that they cannot be easily recycled here in NJ or refilled.

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