The 801C large bore cartridge is recommended for the Dive Rite O2ptima, Kiss GEM, OSEL Apocalypse, and Titan rebreathers.
 
ExtendAir cartridges solve many of the problems associated with traditional granular carbon dioxide absorbents. ExtendAir absorbents use the same chemistry as granular absorbents but in the form of easy-to-use cartridges that are quickly loaded into the scrubber canister (even under adverse conditions). ExtendAir cartridges eliminate problems of channelling and duration variability associated with granular absorbents because they eliminate both settling and individual differences in canister filling technique. ExtendAir cartridges also eliminate the problem of absorbent dust contamination in the breathing loop.