CO2 in a sump? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 12-21-2016, 02:33 AM Thread Starter
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CO2 in a sump?

Hi guys, I have recently turned my 6' tank marine tank back to fresh water. I have a 4' sump as the filter. Am I able to run co2 into the sump? I was thinking of placing the defuser in the last chamber(return pump) end. Or would it be better in the first chamber so it gets more time to infuse the water?

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post #2 of 4 (permalink) Old 12-21-2016, 02:42 AM
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I have CO2 in the return section of my sump which I think is desirable since the CO2 gets into the closed return and then into the tank without being exposed to the atmosphere in the sump. One word of caution remember that when the pumps are off, for feeding or maintenance, the CO2 is just dumping into the sump unless the CO2 system shuts down at the same time. If not shut down, then when the flow is restarted, dumps slightly more acidic water back to the tank initially.

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post #3 of 4 (permalink) Old 12-21-2016, 08:00 AM
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Quote:
Originally Posted by AussieBear View Post
Hi guys, I have recently turned my 6' tank marine tank back to fresh water. I have a 4' sump as the filter. Am I able to run co2 into the sump? I was thinking of placing the defuser in the last chamber(return pump) end. Or would it be better in the first chamber so it gets more time to infuse the water?

Thanks & Merry Xmas
I use an inline atomiser and connect it to the return flow to the main tank. My tank is a 5ft with a 3ft sump.

The loss of co2 is not significant. The reason I say this is because i used a ph pen to measure the ph in the main tank and compared it to the ph in the sump.

The difference in ph between the two location is 0.1. For example, after 4 hours of co2, the reading of ph in the main tank is 6.7 but in the sump it is 6.8.

I think injecting co2 via diffuser is viable but better to put it in the return compartment (or last compartment). You may have to use slightly more co2 to get going depending on the efficiency of the diffuser.

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post #4 of 4 (permalink) Old 12-22-2016, 02:09 AM Thread Starter
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Thank you for the info. Cheers

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