Which is better for co2 diffusion?!? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 03-01-2020, 07:44 PM Thread Starter
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Which is better for co2 diffusion?!?

Hi,

I am looking for an external diffuser/reactor for the co2 in my 800 litre tank

Just wondering which of the below is better?

I want to preferably run one incorporated into the filter outlet to get an even distribution throughout the tank

really struggling to find something good in the uk so would one of these be okay or another recommendation for the 800litre tank?

Thanks

https://www.co2supermarket.co.uk/tur...hose-p194.html

vs

https://www.co2supermarket.co.uk/co2...-500l-p58.html
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post #2 of 6 (permalink) Old 03-02-2020, 07:08 PM
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Quote:
Originally Posted by matt769 View Post
Hi,

I am looking for an external diffuser/reactor for the co2 in my 800 litre tank

Just wondering which of the below is better?

I want to preferably run one incorporated into the filter outlet to get an even distribution throughout the tank

really struggling to find something good in the uk so would one of these be okay or another recommendation for the 800litre tank?

Thanks

https://www.co2supermarket.co.uk/tur...hose-p194.html

vs

https://www.co2supermarket.co.uk/co2...-500l-p58.html
For a tank that large i would strongly recommend you go the diy route and make your own co2 reactor out of 3" PVC

At least I can grow Algae
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post #3 of 6 (permalink) Old 03-04-2020, 07:14 PM
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The input/output are diameter of those reactors are only 12mm ID. If your tubing is larger than this, then it will reduce the flow of the filter. I don't recommend either of them, especially the larger one (I've used this model before) bc the spacer to fit larger tubing caused leaks. Fine gas bubbles will exit from either of those models.
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post #4 of 6 (permalink) Old 03-04-2020, 08:29 PM
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Quote:
Originally Posted by matt769 View Post
Hi,

I am looking for an external diffuser/reactor for the co2 in my 800 litre tank

Just wondering which of the below is better?

I want to preferably run one incorporated into the filter outlet to get an even distribution throughout the tank

really struggling to find something good in the uk so would one of these be okay or another recommendation for the 800litre tank?

Thanks

https://www.co2supermarket.co.uk/tur...hose-p194.html

vs

https://www.co2supermarket.co.uk/co2...-500l-p58.html

If you are able to, a DIY Cerges reactor would be a good option. Depending on all other factors, you may want to run two?

There are some really good build threads on this forum about a Cerges. I recommend looking them up- either way, if you can swing a DIY it is a solid way to go.



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post #5 of 6 (permalink) Old 03-05-2020, 07:26 AM Thread Starter
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Okay cheers

Would you recommend a design to follow or size?

They seem simple enough to make online and I’m more than competent to make one but I always like to make it right first time haha

Cheers
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post #6 of 6 (permalink) Old 03-06-2020, 01:15 PM
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Originally Posted by matt769 View Post
Okay cheers

Would you recommend a design to follow or size?

They seem simple enough to make online and Iím more than competent to make one but I always like to make it right first time haha

Cheers
It really depends on the flow rate of your filter/pump and the available space you have. The more flow, the larger the reactor required to slow down the water long enough for gas absorption.

In my case, each of my canister filters flow 275-300gph in their current setup. Their combined flow would require a fairly large reactor to avoid C02 bubbles in the tank. So I built one reactor (1 1/2" ID x 24" long clear tube) of the Griggs style (https://rotalabutterfly.com/rex-grigg/diy-reactor.htm) for each filter output in order to fit both under the stand cabinet. This also allows for C02 injection at both ends of the tank. For a simple straight thru flow (easiest design) this is about the minimum volume needed for that flow rate, in my experience. If you use a larger diameter pipe, you could shorten the length somewhat.


What is the filter set up & flow rates on your tank?

Last edited by Beachcruiser; 03-06-2020 at 02:05 PM. Reason: typo
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