What are PBRs and why are they so hecking ExpEnsive?
In the photosynthetic world, PBRs is an abbreviation for Photobioreactors. PBRs are bioreactors that also utilize photosynthetically active light sources to promote the growth of biomass that photosynthesize: algae, macroalgae seedlings, plantlets, etc. If you search for PBRs in Google, en masses results follow. We particularly love this design of a moss photobioreactor.