The Planted Tank Forum - View Single Post - Co2 diffusion??? DIY
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Old 11-08-2012, 07:39 PM   #3
Hoppy
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HOB filters tend to splash water with the return waterfall. This liberates the dissolved CO2, leaving you back where you started. If you keep the tank water level high, and/or use other methods for getting the water back to the tank with no splashing, that can work, but not nearly as efficient as other methods.
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