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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
image.jpg
connected buckets
connected buckets
spirulina.jpg
air blower
air blower
 
My honeysuckle is blooming this year! Now to fertilize this tiny ad:
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