I think the small size of the Hagen canister allows the alcohol to kill the yeast faster than in a larger container, therefore if you keep ratio and effective time of mix constant, youll have less CO2
, because there's less fermentation happening. I may be wrong. 2 CO2
canisters certainly produce more CO2
than one canister, with the mixes constant.
As an aside, I got over 100% increase in dissolved CO2
from one powered diffuser than two passive ones (Hagen and bell). I wouldn't be surprised if you beat two Hagen systems with one 2L and a powered diffuser.
Remember venturii injection for CO2
experiment? I'm doing that now at my sump with flimsy 2Ls. Only tested for a few days, but it appears that as long as the mix is producing gas, water won't enter the line and flood the bottles. If I squeeze a bottle, then release, water enters part of the line, but is pushed back to the sump piping as more CO2
is produced. Its very effective, matching my powered diffuser numbers. Perhaps your experiment (where water entered DIY
canister after a day iirc) was because of too much yeast, which puttered out? Just a thought.