Quick Question On Co2...

[Fwapp]

Currently, my CO2 diffuser sits at the bottom of the tank, with the bubbles rising up to be caught in the outflow from the submerged sprinkler bar. As I'm due to go pressurised, my thoughts are that maybe it's more efficient to have the diffuser placed under the filter intake? My thoughts are that by being drawn into the filter, the CO2 will be intergrated into the water, by the pump etc. to a higher degree.

Any draw backs that anyone can think of?

Perhaps making the filter noisier due to hammering ?

I'd like to hear you thoughts.

 

[George Farmer]

I have run both techniques.

I assume your diffuser creates CO2 mist.

CO2 mist i.e. microbubbles being blown about the tank is the most effective if you have decent circulation and the bubbles are spread throughout the water column effectively. More expensive diffusers create a finer mist. Disadvantages are equipment in the tank and bubbles everywhere. FYI when I eventually set up my new 90cm then I'll be running CO2 mist using an ADA glass diffuser and lily pipe. Pricey but effective.

CO2 direct into external filter works well too. Less equipment in tank but there can be some noise and there's also the possibility of cavitation i.e. CO2 "air" pockets in the filter that result in sporadic output. This is generally rare I think unless you're running a high bubble rate.

Another option is an in-line reactor. No noise or chance of sporadic output. There are DIY versions on the net, as well as off-the-shelf units.