connecting co2 line to eheim 2028 filter


Junior Poster
Nov 1, 2007
hi everyone ... i was trying to properly infuse co2 into my tank without the unsightly equipment that i am currently using .. which is a Dennerle Pro Reactor connected to a small water pump.

i stumbled upon the idea of connecting my co2 bottle into the intake of my Eheim 2028 filter..

i cant find any information as to how to connect this system up properly, would anybody have any information or point me in the right direction…

Cheers in advance.


Junior Poster
Nov 12, 2007
Hi Ziggy, I'm by no means a pro but I've researched many ways of incorporating Co2 into a tank, externally. I'm not sure how people tap into the intake line on those filters, but in many instances, it has caused problems. Directly injecting Co2 into a filter will cause burps in the system by constantly injecting air into a filter that is not designed to have air in it all the time. It can cause premature motor failure, or an impeller lock from an overload of air in the system. I've also read the Co2 gas itself is not good for the parts.

If you want to incorporate Co2 externally, it's generally a good idea to use a reactor inline after or before your pump, and not to use the pump itself as the reactor. Sorry if this didn't answer your question but I thought it wouldn't hurt to share the info I've gathered.


Plant Guru Team
Lifetime Member
Sep 23, 2007
South Florida

I agree totally with the reply from sayhy2Mark33......

A reactor is one of the best ways to go and can be kept outside or underneath the tank.

Please read this article and see if it helps.

There are many other threads/posts on this site that will help you.

That said, how big is your tank? That will dictate the size/type of equipment, no?