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Discussion Starter · #1 ·
I am doing the DIY CO2 method for my fish tank. This forum has been awesome, but I just have one question. I bought a check valve, one side says in the other says out. Am I correct that the "in" side should be closest to the Yeast bottle?
 

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Mine has little arrows on it indicating the flow. Point the arrows away from your yeast and into your tank.

If your's just says "in" and "out" then yes, i'd say the "in" side is the yeast side and the "out" side goes to your tank.
 
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