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growing spirulina in closed loop photobioreactor on roof tops

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Recently i have come across a thailand company which is growing spirulina on roof top in connected buckets.

the description is in the video https://www.youtube.com/watch?v=7jZbp3xzXNU

can any body please explain how just using one airblower they are able to transfer liquids continuosly from one bucket to other and how the plumbing of the buckets is done.
roof top spirulina
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connected buckets
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air blower
I have gone to look for myself. If I should return before I get back, keep me here with this tiny ad:
A rocket mass heater heats your home with one tenth the wood of a conventional wood stove
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