Can this filter add CO2? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 09-30-2017, 04:08 PM Thread Starter
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Can this filter add CO2?

I stumbled upon this filter. It has a small hose that sits above water line and supposedly draws air into the tank. Do you guys think it helps in drawing CO2 into the tank as well? I think it makes sense. I saw alot of growth in my tank in my low tech tank, but I'm not sure if that was due to the warmer temperature. Just curious.

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post #2 of 4 (permalink) Old 09-30-2017, 04:30 PM
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Hi rollinghills,

Absolutely! You can either feed the CO2 in through the Venturi hose or you can follow the instructions in this thread. I personally have done it both ways.

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post #3 of 4 (permalink) Old 09-30-2017, 04:57 PM Thread Starter
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Oh no, I didn't mean modifying it to inject CO2. I was just wondering if the air pulled in from the tube adds CO2 to the tank since I think there's more CO2 in the air than the water? But I could be way off lol. I just looked at my purchase date and it was in early August, so maybe it wasn't the warmer temp that contributed to the good growth but the filter? It would be cool if this filter does add some CO2.
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post #4 of 4 (permalink) Old 09-30-2017, 05:03 PM
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No it will not add more CO2 by itself than the normal exchange from the water and air. One reason we want water to move from the bottom of the tank to the top is so that there is a "gas exchange". But as long as the water is all being exposed to the air, there will be no extra CO2 added with a pump. Kind of like adding water to a bucket that is running over? More may go in but an almost equal amount will come out.
The reason injecting CO2 works is that we are adding a high concentration of it which is expected to be higher than the normal amount gassing off at the top.
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