Scuba Forum > Pony tank
#3062
Indiana - 3/01/2010 6:29 PM
I also think 19 would be plenty.Just say you where at 120 ft.It took you 4 minutes to ascend which is very conservative and a 3 minute safety stop.Say you use 2 cuft per minute.That is 14cuft.You would have 5 cuft left.That should be fine