CO2 scrubber

A CO2 scrubber, also referred to as an air filter, is a device which cleans carbon dioxide(CO2) from the air to produce clean oxygen. They are often used on spaceships.

Destiny
When the Tau'ri first arrived aboard the Destiny after the Battle of Icarus Base they discovered that many of ship's CO2 scrubbers were either malfunctioning or failing. The scrubber nodes are found behind grates in the wall aboard the Destiny. After investigating a malfunctioning scrubber is was discovered that the reason it was not working was that the filter was full of alkaline, the used-up residue of whatever substance the Ancients used to clean the air. Detecting the new arrival's problem the Destiny's computer found a planet with a possible solution and dropped out of FTL in a system with four Stargates and choose a desert planet which could possibly have what they needed. After traveling to the planet they eventually returned with a material which allowed for the scrubber to work again, though it is unknown how long it will last.