ExHale XL CO2 Bag stocked Does it require electricity or

Does it require electricity or a pump

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ExHale XL CO2 Bag stocked Does it require electricity orThe XL ExHale CO2 Bag is for medium to large grow spaces. The XL will provide a 6x6 foot or 288 cubic foot space with CO2 for 6 months guaranteed. The XL ExHale comes with a freshness seal that doubles as a hanger. Steady supply of CO2 for 6 months guaranteed Maintenance free No heat No electricity Patent pending genetics Suitable for Organic Production Made in the USA How to Use ExHale ExHale comes complete, simply follow the instructions and place