Looks like you are pretty handy with drink bottles. Ever thought of taking up water rocketry?
That is quite a setup you have there though. What kind of pump to do have sitting in that trash can.
Have you ever had any trouble with water being pushed back into your CO2 reactors? I don't see a check valve on the co2 line. That would be something I would add just in case.
(Opps never mind I found the check valve
)