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The air in a spacesuit is constantly circulated. The suit air is passed through a type of absorbent filter that absorbs carbon dioxide called a scrubber.

This clean air is returned to the spacesuit, usually with the addition of a little fresh oxygen. In addition to having a limited supply of oxygen, the astronaut must also estimate how much carbon dioxide the filter has absorbed. It has a limited capacity, and once it is maxed-out, it can no longer remover carbon dioxide.

When the astronaut is back aboard the spacecraft or space station, they will resupply the oxygen and put in a fresh carbon dioxide scrubber.

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