~ I did what you said first, every night I disconnected the CO2 from the dissolving chamber, allowing it to vent into my room. I soon got tired of this because I had to reach into my tank every time, and removing the line from the dissolving chamber, and I didn't want to spill a liter of sugar water into my tank stand again after removing the cap, so I built a shut off valve using quick disconnects, a 1/4" T quick disconnect, and a 1/4" spring check valve, and a 1/4" Shut Off Valve quick disconnect. I attached the T to the out line from the CO2 Generator, then connected the check valve to the middle of the T, flow direction is out, so it can vent the CO2 if it ever pressurizes to much, lastly the shut off valve is connected to the T at the top by the tank's dissolving chamber. Now I can shut the valve off killing the CO2 to the dissolving chamber but still be safe from a pressurized CO2 bomb, the spring check valves are used for air pumps so they take about a psi or two to break the seal and allow the CO2 to be vented off. This might seem complicated but I find turning a shut off valve off instead of removing the line from the chamber or removing the cap of the container and possibly spilling the mixture all over the place to be a lot easier of a solution to this DIY problem of shutting of the CO2 at night.