Why does the O2ptima use a cartridge CO2 absorbent instead of granular?
The cartridge is easier to use than granular, with a lower work of breathing and a much more consistent duration. For equivalent CO2 absorbtion capacity, the cartridge weighs significantly less than granular absorbent. There are some other benefits as well; the cartridge is not subject to channelling and cannot introduce absorbent dust into the breathing loop.
