Harvesting in Horizontal tubular PBR

[guru]

I wonder how companies are harvesting algae in Horizontal Tubular Photobioreactor as the arrangement seem to be complex? Is it just by pumping water with high pressure? Is there any special equipments available for cleaning such PBR?

[BioBert]

I've seen the big round wheel covered with cloth thing that one company used. I think they should use a clear poly type tubing inside the tube/cylinder and once you empty the algaewater into a mesh bag, then take the liner out and squeeze it like a tube of toothpaste to get it all.