Best way to inject CO2 in a sump? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 07-07-2019, 10:46 AM Thread Starter
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Best way to inject CO2 in a sump?

What is the best way to inject CO2 in a sump. Tank is 100 gallons. Will have a sump but I don't want to hook into the return outlet of the pump. Can I add another small pump within the sump and just inject the CO2 somehow directly into the sump?


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post #2 of 7 (permalink) Old 07-07-2019, 01:18 PM
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One way is to use a needle wheel skimmer pump inside the sump, the co2 line goes in the ventri port, an output tube can be routed to whatever chamber you want to minimize micro bubbles. It's a very simple and effective way to add co2 in large tanks. I use a Coral Box DCA1500 with needle wheel package on maybe 20% power.


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post #3 of 7 (permalink) Old 07-07-2019, 06:08 PM Thread Starter
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Will standard CO2 tubing fit on the needle wheel thingie? All the pictures I have seen the tubing looks larger.


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post #4 of 7 (permalink) Old 07-07-2019, 07:23 PM
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Why not use a reactor? Thats the most common way of having CO2 in a tank when you have a sump.
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post #5 of 7 (permalink) Old 07-07-2019, 07:36 PM Thread Starter
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Is it possible to hook the reactor to a pump independent of the one running the filtration in the sump and just recirculate it back into the sump?


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post #6 of 7 (permalink) Old 07-07-2019, 10:18 PM
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Yes definitely, but you will waste some amount of co2 doing that into your sump where it will out gas instead of going into your tank. Why not put it directly into your tank return line? That is the way of I think every sump system I have seen using a reactor.
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post #7 of 7 (permalink) Old 07-07-2019, 11:29 PM
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Quote:
Originally Posted by Triport View Post
Will standard CO2 tubing fit on the needle wheel thingie? All the pictures I have seen the tubing looks larger.
Yes, instead of fitting over it, the co2 line fits loosely inside the venturi input. There's no back pressure so I don't even use a check valve.


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