We only stock and sell the smaller granule Sofnolime™ 812 Mesh (Grade 797) non-indicating absorbent designed specifically for use with all modern semi-closed and closed circuit recreational sport and technical diving rebreathers that require granular carbon-dioxide absorbent.

An absorbent grade used in commercial diving hyperbaric chamber systems is "Grade CD" which is generically referred to as 408 and typically lower cost but much less absorption capacity. Some very early rebreather designs may still specify 408 absorbent, but today this is rare. For a discussion of the differences between Grade 797 and Grade CD absorbent, see our TekTip titled CO2 Absorbent: 797 vs 812 vs 1025.

Divers Supply Inc in Gretna, LA (not to be confused with a different company by the same name in Florida) is a popular source for 408 mesh Commercial Diving grade indicating absorbent.