Carbonate drinks with compressed air?
So there are a lot of carbonators out there, and they all cost in the range of $50-$100, which is a lot, but the real cost comes form the co2 cartridges. So I was wondering.... why not just use compressed air? sure, it would take longer for all the co2 in the compressed air to reach equilibrium between the water and the air, but i do believe that if you let it sit for long enough, it would work.
other gasses would also diffuse into the water, like oxygen, but since gasses are hard to taste, it shouldn't make a big difference. (co2 actually forms carboxylic acid, which tastes sour, but i can live with it not being exactly the right taste)
all i have to test this theory is 115 psi from an air compressor... would this be enough?