20oz tanks, but i could rig up a bunch in series, and i can get them refilled for free at work so its not much added cost...

also an electronic solenoid would be a good idea, i think i can get my hands on one for a paintball gun for free, my good paintball gun uses an electronic solinoid, but im not about to scrap that

and yes, the gauge is in PSI

the HARDEST thing seems to be calculating how much co2 is in the room, the sensors are SOOOO expensive... wonder if i can buy a carbon monoxide detector and switch the sensor with a co2 sensor (would cost around 70 bucks to do) but not sure it would work.... if it does, i could rig the alarm to trigger the solenoid to turn off
Raelum Reviewed by Raelum on . paintball inspired C02 system i havent started growing yet but ive been reading heavily into it and comparing systems, cost, effectiveness etc... i originally was going to go with a 16 plant ebb and flow system, but have deeply considering NFT as well (worried about clogs in the lines while at work) well anyways, i believe i came up with a relatively cheap way to add c02 without buying those really expensive computer controlled propane systems... using a paintball gun front block + regulator + macroline and tank ASA Rating: 5