Medical Rebreather Bags

Re-breath bags What is a rebreather bag? Equipment. A rebreather mask has a plastic reservoir bag that saves one-third of a person’s exhaled air, while the rest of the air gets out via side ports covered with a one-way valve . This allows the person to re-breath some of the carbon dioxides, which acts as a way to stimulate breathing. How long can you stay underwater with a rebreather? A single fill of a small gas cylinder or cylinders and CO2 scrubber can last for anywhere from one to six hours , depending on which rebreather it is. Unlike open-circuit scuba, your gas duration on a rebreather is nearly independent of depth, so you could, in theory, spend all that time on the bottom.