Best Place To Inject Co2 In A Sump.

As the title says, I’m looking for the best place in my sump to inject CO2.
I have a bean animal overflow with the drain 1” under water.

The drop in between baffles is no more than 1” so water gently flows over them, no splashing.
I suppose the best place to inject Co2 would be the first baffle where the main drain is to have maximum CO2 diffusion with minimum to no mist/co2 bubbles by the time it returns to the tank?

The initial plan was to run a GLA in-line aluminum diffuser on the return line but I’ve used the similar UP-Aqua in the past and Co2 mist was just too much.

I was thinking maybe a ceramic disc stuck to the bottom of the sump and just rely on the sump to break down co2 bubbles by the time they reach the return pumps?

What do you guys suggest?

Sorry for the long post!

 

Bump! Anyone?

 

I see...
There’s no perfect scenario, I used to run a canister filter and lily pipes and surface scum was always a problem...
Surface skimmers were an eye sore too even though they worked.
Now I’ve got crystal clear surface and arguably less tank clutter but will burn more CO2;

I believe gas exchange should be way better with this setup.
Really don’t mind refilling the cylinder a little earlier than needed but get the “other” benefits.
I just didn’t want to see the fizz in the tank. I guess I’ll try an in-line atomizer on the longest return line and see what that gives me.
If not, build a reactor and try it that way...

Tim, I also believe different sump designs and overflow configurations will yield different results as far as CO2 loss goes and sumps can’t be generalized.
Some will be more turbulent and mix way more air with the water thus losing more Co2 where a full siphon configuration with minimal water drop from baffle to baffle or overflow box will be way more efficient in this regard.
Hoping to find out soon enough, was just wondering if there’s something else that I haven’t thought of yet.

Thanks Tim! Will keep this updated after the dry start is over and be finally injecting Co2.

 

How about drilling a hole big enough to fit the co2 tubing into the side of the drain pipe right before it enters my filter sock? So tubing straight from the needle valve to the pipe.
Full siphon and the fact that the pipe drains under water should be a perfect scenario? Or not...
Gotta try it...