you're not going to save much cost by doing that 99 -> 97% isnt much difference in helium. the difficulty is not in the quantity of helium but the purity. if yo

you're not going to save much cost by doing that 99 -> 97% isnt much difference in helium. the difficulty is not in the quantity of helium but the purity. if you dont care much about the purity it will be cheaper to produce.