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Closed loop may refer to:
- A feedback loop, often found in:
- Closed ecological system not relying on matter exchange outside of the system, as opposed to open loop
- Ecological sanitation systems or ecosan, intended to close the nutrient and water cycle
- Pulling water from one area of a reef aquarium and pumping it immediately elsewhere in the tank to create higher flow and minimize dead spots
- Circular economy, one in which materials are consistently reused rather than discharged as waste
- Closed time loop, or predestination paradox, a paradox of time travel that is often used as a convention in science fiction
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