Comment on 3 is enough. You don't need a fourth. Rotate using all 3 equally instead of spending 99% of the time on just one of them

kboos1@lemmy.world ⁨3⁩ ⁨days⁩ ago

I read somewhere that it’s because you only breath out of one at a time, they take turns. One closes off when it gets too dry and the other takes over.

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