"Squid" wrote in message
...
On 9 May 2004 07:19:25 -0700, (Dave) wrote:

I used to inject CO2 into my canister filter, but now use a Hagen
Natural Plant System diffuser. Hides easily behind some background
plants, no maintenance, works great in my heavily-planted 29g tank. I
can't say whether it would be adequate for larger tanks.

Does yours emit the order from the container?

I only use the diffuser, not the entire system.