I need to deoxygenate several liters of polar solvents such as methanol and EG. I need these to remain as oxygen free as is PRACTICAL in some heavy wall polyethylene containers (not vacuum strong). I plan to flush an oxygen free gas such as nitrogen at about 1PSI, 24/7 whether the laser is running or not. What would be a best gas choice? Would some kind of O2 scavenging material within the container be a better choice than the flush?