The Planted Tank Forum - View Single Post - Question about check valves
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Old 11-20-2012, 05:08 PM   #3
Planted Tank Obsessed
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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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