this post was submitted on 19 Jun 2026
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[–] givesomefucks@lemmy.world 3 points 1 week ago* (last edited 1 week ago)

It has nothing to do with how pools work...

It's about how visible wavelengths work...

Edit:

To actually explain it, red wavelengths are shit at going thru water

Send light to the bottom of a pool and it reflects back as just blue off white.

Send it to the bottom of even a shallow pool that's dark blue, and you get back black. Which warms the water and helps algae. With the green algae, you get even blacker water.