Acronym for Environmental Control and Life Support System used on the International Space Station

Wikipedia writes to say

is a life support system that provides or controls atmospheric pressure, fire detection and suppression, oxygen levels, waste management and water supply. The highest priority for the ECLSS is the ISS atmosphere, but the system also collects, processes, and stores waste and water produced and used by the crew—a process that recycles fluid from the sink, shower, toilet, and condensation from the air

More detail may be obtained from the linked article.

Consider applying this tag when your question is on the subject of the

  • ECLSS in general
  • Atmosphere aboard ISS
  • Conflagration control
  • Waste management
  • Water management