TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Photobioreactor: The flow-through photobioreactor further comprises an algae reservoir attached to the thermoplastic multi-wall sheet, where the algae reservoir is positioned above the thermoplastic multi-wall sheet so that algae flows into the thermoplastic multi-wall sheet. The thermoplastic multi-wall sheet has two or more inner walls, where the inner wall is arranged parallel relative to the upper and lower layers. The inner wall is arranged perpendicularly relative to the upper and lower layers or diagonally relative to the upper and lower layers. The two or more inner walls are independently arranged in one or more of parallel, perpendicularly and diagonally relative to the upper and lower layers. The upper layer of the thermoplastic multi-wall sheet has a light transmission of greater than 70-87%. The thermoplastic multi-wall sheet has a thickness of 1-10 inches, preferably 4-6 inches. Preferred Process: In producing biofuel, the biofuel is selected from biodiesel, bioethanol, biogasoline, biomethanol, and biobutanol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: In the flow-through photobioreactor, the upper layer and the lower layer are each made of one material independently selected from transparent or translucent polycarbonate, co-polycarbonate, polyestercarbonate, co-polyestercarbonate, siloxanepolycarbonate, siloxane-copolycarbonate, polyester, co-polyester, polyvinyl chloride, co-polyvinyl chloride, polymethylmethacrylate, co-polymethylmethacrylate, polypropylene, cyclic olefin copolymer, fluoropolymers, thermoplastic olefin, styrene acrylonitrile, thermoplastic polyurethane and transparent or translucent blends. The inner cap layer is made of a member selected from co-polycarbonate, polyester, co-polyester, polyvinyl chloride, co-polyvinyl chloride, polymethylmethacrylate, co-polymethylmethacrylate, polypropylene, cyclic olefin copolymer, fluoropolymers, thermoplastic olefin, styrene acrylonitrile, thermoplastic polyurethane, transparent or translucent blends and clearcoats. Preferred Parameters: The outer surface of the thermoplastic multi-wall sheet has applied to it one or more outer cap layers. The outer cap layer is co-extruded, laminated or painted to the outer surface of the thermoplastic multi-wall sheet. The inner surface of the thermoplastic multi-wall sheet has applied to it one or more inner cap layers. EXAMPLE - No example given.