this post was submitted on 19 Jun 2026
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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.