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[i]The installed primary lithium hydroxide cartridge was used for approximately 27 hours (82 man-hours) following activation of the lunar module at about 58 hours. The secondary cartridge was selected at about 85 1/2 hours. During operation of the lunar module carbon dioxide removal system, the level was permitted to increase to an indicated 14.9 mm Hg. The primary cartridge is nominally rated for a usage capacity of 41 man-hours at 520 Btu/man-hour. The secondary cartridge, nominally rated for about 17.9 man-hours, was used for 8 1/2 hours (25 1/2 man-hours). This cartridge is identical to that used in the portable life support system. A second primary cartridge was installed and used for approximately 6 minutes, but for the remainder of the mission, command module lithium hydroxide cartridges were operated in a special arrangement. One side of each of two command module cartridges was covered and sealed with a plastic bag normally used to store a liquid-cooling garment. One corner of the bag was sealed to the inlet of the suit circuit hose. The cabin atmosphere then returned to the lunar module suit circuit through these supplemental cartridges by way of the two outlet hoses. The mass flow through this arrangement was partially restricted with tape to properly load the suit-circuit compressors. After approximately 20 hours of operation with two command module cartridges, an additional unit was stacked on each original cartridge to improve the carbon dioxide removal capability. With this supplemental configuration, when only command module cartridges were being used, the indicated carbon dioxide level was maintained between 0.1 and 1.8 mm Hg.[/i]
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