Active Air 50 lb CO2 Tank

Aluminum CO2 Tank for Supplemental CO2 Systems, 50 Lb

Supplemental CO2 is one of the more reliable ways to raise photosynthesis rates and yields in a sealed or semi-sealed indoor growing environment. Plants use CO2 as the carbon source for photosynthesis, and lifting CO2 concentration from ambient atmospheric levels of roughly 400 ppm up toward 1,000-1,500 ppm accelerates growth rates whenever light and other environmental factors are not the limiting variable. A dependable, properly certified tank is the starting point for any supplemental CO2 setup, since regulators, controllers, and timers all depend on it holding pressure safely.

The 50 lb tank ships with a protective plastic collar and holds more than double the CO2 volume of the 20 lb size, cutting refill frequency for a larger commercial room or multi-room facility running CO2 continuously.

Key Features & Benefits

• High-strength aluminum alloy — lighter than a steel tank of equivalent capacity while still holding structural integrity for CO2 storage under pressure.
• Rust-resistant construction — aluminum does not rust the way steel can, which matters in the humid conditions typical of a supplemental CO2 grow room.
• DOT 3AL / TC 3ALM certified — manufactured to U.S. DOT 3AL and TC 3ALM standards and inspected and tested by a DOT/TC authorized independent agency.
• 1800 PSI max fill pressure — rated for a maximum fill pressure of 1800 PSI.
• Standard CGA-320 fitting — connects directly to standard CO2 regulators, valves, controllers, and timers without an adapter.

Who Should Use This CO2 Tank

This tank fits indoor growers running a sealed or semi-sealed room who supplement CO2 to raise photosynthesis rates, particularly under high-intensity lighting where CO2 availability, not light, is what caps growth. It ships empty, so it also suits a grower who already has a regulator and controller in place and only needs a certified cylinder to fill and connect.

About Active Air

Active Air is an indoor gardening equipment brand with more than a decade behind its catalog of grow-room climate and CO2 hardware, including portable AC units, inline exhaust fans, dehumidifiers, carbon filters, ducting, and CO2 tanks and systems. The brand's equipment is built around a single goal: keeping the atmosphere inside a sealed grow space, temperature, humidity, airflow, and CO2 level, within the range a crop needs to keep growing at pace.

Frequently Asked Questions

Does this CO2 tank come filled?

No, the Active Air CO2 tank ships empty. Fill it at a local welding supply store, homebrew shop, beverage gas supplier, or another commercial CO2 provider before connecting it to your system.

What fittings does the tank use?

It uses a standard CGA-320 fitting, which is compatible with standard CO2 regulators, valves, controllers, and timers. Most supplemental CO2 equipment sold for grow rooms is built around this same fitting, so compatibility issues are rare.

Why choose an aluminum tank over a steel one?

Aluminum tanks are lighter than steel tanks of equivalent capacity, which makes them easier to move and reposition. Aluminum also does not rust, an advantage in the humid conditions common to indoor grow rooms where a steel tank could corrode over time.

What certifications back this tank?

The tank is manufactured to U.S. DOT 3AL and TC 3ALM standards and has been inspected and tested by a DOT/TC authorized independent inspection agency. Maximum fill pressure is rated at 1800 PSI.

How often does a CO2 cylinder need hydrostatic testing?

DOT and TC regulations call for periodic hydrostatic testing of CO2 cylinders, typically every 5 years for an aluminum tank, though the exact interval depends on your jurisdiction. Your CO2 fill provider can check the stamped test date on the tank collar and tell you whether it is due for retesting.