but thats not the question... what is the volume of pure 0² needed for a diver to stay under water for an hour... I think a 32% mixture is pretty standard for low level diving, but if its 21% and I breath a litre of air every second or so I figure thats about 12.6 litres an hour of pure oxygen which is roughly 3.3 gallons of oxygen per hour. If it takes 500,000 gallons of seawater to produce 3 gallons of 0²... well then, this invention would kill a reef in no time at all

it just doesnt add up! I'm sure its my math, but wow