I notice that a majority to ballast system being used nowadays are gasless, most use a electric pump to,  fill and empty either a rigid tank ( vented or sealed) or a bag/ bladder, or suck in air through an induction pipe ( snort/ snorkel). I remember David mentioning that if you boat goes deep gas is the only means of bringing it back up. 
							
						
					Shift from Gas to Electric
				
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