Our carbon dioxide (CO2) absorbents are diving grade for use in marine applications.
Because there are a great many types and formulations of carbon dioxide absorbent, it is critical to use only the specific CO2 absorbent recommended by the manufacturer of your specific model rebreather. Proper storage is a necessity as well, in order to maintain the correct balance and distribution of moisture.
Learning From Analysis of Rebreather Deaths
The June 2013 issue of Journal of Diving and Hyperbaric Medicine contains an excellent article that analyzes the causes of recreational closed-circuit rebreather fatalities. It concludes that while rebreathers have an intrinsically higher risk of mechanical failure as a result of their complexity, this can be offset by good design incorporating redundancy and by carrying adequate alternative gas sources (i.e. 'open-circuit bailout') in the event of a failure. Fatalities may be further reduced by diver training and rebreather designs that minimize the chances of human-machine interface errors. For more information read Analysis of Recreational Closed-Circuit Rebreather Deaths 1998-2010 by Andrew W Fock.