See, I was thinking along those lines too. While coming down whatever trigger they use for the algae would work with gravity but would struggle against it on the way up. And wouldn't know how well it would work considering the algae in RWE PBR might even accumulate near the bottom of the tubes making potential jams . Hell, I'm probably over thinking this stuff anyway. Couldn't really find anything "hard" about RWE's PBR.
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