The next step in the build process is to assemble and install the CO2 scrubber canister. The O2pitma can be used with either the Micropore ExtendAir cartridge or it can be packed with loose granular CO2 absorbent. This section will deal with using the ExtendAir cartridge. If you are using loose granular absorbent, skip to the next section, How to Pack the Scrubber.
To use an ExtendAir cartridge, begin by inspecting all of the scrubber components. Look for any damage, dirt, debris, or excess lubrication on the scrubber canister, ExtendAir cartridge, scrubber end cap, electronics head, bore plug nut, and seals and O-rings. Any damage or contamination can cause a loss of water integrity and flooding of the breathing loop.
Next, remove the ExtendAir cartridge from its packaging and, using a permanent marker, mark the installation direction on the side and/or end of the cartridge. If the cartridge is removed between dives and then later reinstalled, it is critical that the cartridge be reinstalled in the same orientation to prevent premature CO2 breakthrough. Install the cartridge by sliding it all the way into the canister (See Figure 2).
