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The CO2 scrubber is used to fill oxygen bottles, CO2 bottles, and add a breathable atmosphere to the base. It is unlocked from the Materials Tech Tree from the CO2 Scrubber technology in Research. It can be built in the workshop, canteen, hangar, and HQ.
There are valves and levers on the inside and outside of the machine that can be pulled that can regulate machine temperature only when it is off. If it reaches 100 degrees Celcius, the machine will explode and catch fire. It needs to be put out with the fire extinguisher and repaired immediately.
A CO2 Scrubber is essential for removing CO2 from the air. Air polluted with CO2 is pumped into the scrubber, which reaches an ion exchange resin that isolates the CO2 molecule from other gases. In this way it generates oxygen and allows astronauts to be in the base without a helmet.
The filter is equipped with knobs and levers for optimal oxygen production. They can only be operated when the device is turned off. With sufficient oxygen in the base, it is possible to create an oxygen bottle. Warning: the device explodes when it reaches 100 degrees. It is possible to place more than 1 filter in the Martian base.
Carbon Dioxide may play an important role in making Mars a planet habitable for humans, but this does not change the fact that in a longer perspective, CO2 is, in fact, an enemy of humankind. If the habs and other facilities created to shelter Mars explorers are to be fit to occupy, it's urgent to constantly extract this respiratory side-product by the use of special filtering systems. On the one hand, removal of carbon dioxide can be done by chemical reaction as well, as it was done by sprinkling lime in early submarines in 1940s. However, technological advancement allowed scientists to design CO2 scrubbers that filter the air, and remove carbon dioxide from atmosphere in a healthier way. Besides submarines, CO2 scrubbers were used also by NASA. Carbon Dioxide Removal Assembly (CDRA) was extremely useful part of the International Space Station, which actually allowed the station to operate. CO2 Scrubbers, like CDRA, in order to be recyclable machines, and not to waste precious O2, are arranged to cooperate with CO2 Sabatier reaction tools that produce methane and water.
