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"I don't know why I write science fiction. The voices in my head told me to!"
- Charles Stross

Filt-Plug  
  A nose plug worn to collect moisture from exhaled air.  

On parched Arrakis, the wise traveler wears filt-plugs and a breathing mask over the mouth, to conserve moisture.

FILT-PLUG: a nose filter unit worn with a stillsuit to capture moisture from the exhaled breath.
From Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

Here are a couple of additional quotes:

"In the open desert, you wear this filter across your face, this tube in the nostrils with these plugs to insure a tight fit. Breathe in through the mouth filter, out through the nose tube. With a Fremen suit in good working order, you won't lose more than a thimbleful of moisture a day - even if you're caught in the Great Erg..."


(Filt plug from Denis Villeneuve's 2020 film Dune)

Paul's stillsuit rode easily on his body and he was only distantly aware of his nose plugs, the breathing mask..."

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Additional resources:
  More Ideas and Technology from Dune
  More Ideas and Technology by Frank Herbert
  Tech news articles related to Dune
  Tech news articles related to works by Frank Herbert

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