# Is this possible? \[filtering oxygen from water to breathe\]

**URL:** <https://boards.straightdope.com/t/is-this-possible-filtering-oxygen-from-water-to-breathe/811667>\
**Category:** Factual Questions\
**Created:** [April 2, 2018, 8:40pm UTC](https://boards.straightdope.com/t/is-this-possible-filtering-oxygen-from-water-to-breathe/811667 "2018-04-02T20:40:48Z")\
**Posts on this page:** 2\
**Page:** 3

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**Author:** ![Darren\_Garrison](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/darren_garrison/32/92_2.png) [@Darren\_Garrison](https://boards.straightdope.com/u/Darren_Garrison)\
**Post date:** [April 5, 2018, 1:01pm UTC](https://boards.straightdope.com/t/is-this-possible-filtering-oxygen-from-water-to-breathe/811667/41 "2018-04-05T13:01:52Z")

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BTW, if you read about the latest version (2016) of the proposal from the Triton, they no longer claim to be 100% filtration based, and instead one of the two branches is a receptacle for small cartridges of liquid oxygen. Breathing that in will also assist you in being able to spend the rest of your life under water.

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**Author:** ![Colophon](https://avatars.discourse-cdn.com/v4/letter/c/f05b48/32.png) [@Colophon](https://boards.straightdope.com/u/Colophon)\
**Post date:** [April 5, 2018, 2:02pm UTC](https://boards.straightdope.com/t/is-this-possible-filtering-oxygen-from-water-to-breathe/811667/42 "2018-04-05T14:02:21Z")

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Triton’s blurb says this: _The device uses “artificial gills”, a filter with holes smaller than water molecules but large enough for oxygen to pass through._

I’m wondering on which planet an O[sub]2[/sub] molecule is smaller than an H[sub]2[/sub]O molecule.

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