Best Place To Inject Co2 In A Sump.

Sumps aren't really the most efficient place to inject CO2, too much off gassing; you'll go through a lot of gas to get optimal conc in the tank. Even tanks with sumps that inject directly in to the tank will loose far more CO2 than tanks with canister filters. But that said, if I were you I'd inject directly below the outlet back to the aquarium. I would have thought that the cavitation created by the pump impeller will help dissolved the gas in to solution so the mist won't be so apparent.

 

Bean or Herbie should off gas far less CO2 than a Durso variant setup will. I need to drill the tank for a new overflow and I’m building a new sump that will use mattenfilter “plates” with minimal drop. The largest drop will potentially be into the pump chamber depending on the water level.

Injecting the CO2 before the sponge plates would definitely eliminate any mist going into the tank. Injecting just before the pump should theoretically chop any mist even finer and hopefully diffuse it faster/finer. It’ll be interesting to see how that will work. It should just be moving a diffuser or a tube from one chamber to the other and seeing what happens.

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S

 

I'm in the process of setting up a sump with a Bean Animal "ghost" style overflow on my 200 liter tank but I plan using a 20 inch filter housing as a CO2 reactor inline with the return. I have the housing over half full of bioballs in the hope that it will be enough to avoid the 7up look.

I will be interested in seeing how your plan works out as my backup plan involves using the old inline atomic diffuser to feed from a separate submerged pump but I'm worried about how that will work against the pressure from the return pump unless I figure out some sort of venturi setup.

Let us know how it goes.

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I have an atomic inline diffuser, I feed a sera 1000 reactor with it. There’s some co2 mist but I would say its 80-90% less, and the bubbles coming out are all the same size. If you still get some misting in your tank you could always drop one into your sump and power it with a small submersible pump, sort of a mini closed loop. There’s a video of one of these things working submersed here. https://barrreport.com/threads/20gl-shallow-tank-plant-farm.14880/page-2#post-148928

 

Just wondering how it worked out?
I imagine that you off gas most of the co2 in the sump before it reaches the return pump and enters the tank.