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Can you use food grade co2 for aquarium?


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There is nothing specific in the industrial grade CO2 that your tank needs or conversely something that is missing from the food grade that I am aware of? One is 99.9% pure, while the other is 99%.
 

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Industrial = 92% pure, Food Grade = 95% pure, Medical = 99% pure.

The gas is all the same, the impurities come from the type of CO2 tank it comes in. Medical has a glass-lined CO2 tank, not sure about the others.

I use Food Grade from a home brew store, and I've been using it for a decade. Perfectly fine.
 
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