Potential problem with the ISS

On a recent spacewalk the crew aboard the International Space Station found mysterious black spots, or residue, around some port vents. These vents are used to pass residue and contaminents, over board, produced by the carbon dioxide removal system. This residue seems to be sticking to the vents and could be what has caused past problems with the stations air rejuvination system. Could this be a major problem in the future if these vents continue to become clogged?


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