NOVELTY - An algal floway (AGF) system comprises algal floway structure comprising tub comprising first sink (6) on a first end of the tub, second sink on an opposite end of the tub, and a horizontal surface between the sinks; substrate on the horizontal surface of the tub; membrane on a surface of the substrate, where the membrane supports the attachment and entrapment of algae; and pump (4), where the pump circulates algae culture from algae cultivation reactor through the AGF floway structure.    USE - As algal floway (AGF) system used for cleaning eutrophic water bodies, optimizing water usage in algal cultivation, reducing atmospheric CO2, enabling access to clean water, enabling access to algal food sources for humans and other animals, and improving the economy of algae based biofuels (claimed).    ADVANTAGE - The system provides continuous, specific, economical, and efficient harvesting of algae biomass. This system selectively harvests old, large sized, flocculated and filamentous algae from continuous algae growth system. As algal cells grow old they tend to increase in size, grow slowly and tend to flocculate as clumps. If not separated from an active algae growth system, they tend settle at the bottom of the pond getting degenerated, which may result in a pond crash or overall slow growth. Removing such fat and old algae serves two purposes: it clears the growth system from old cells and provides more chances to young cells to grow and produce more biomass. The AGF system is an ideal harvester for such algae, as it selectively removes flocculated and large sized algal cells.    DETAILED DESCRIPTION - An algal floway (AGF) system comprises an algal floway structure, where the algal floway structure comprises tub comprising first sink (6) on a first end of the tub, second sink on an opposite end of the tub, and a horizontal surface between the sinks, where the first sink comprises opening on base of the first sink for feeding algae culture from an algal cultivation reactor to the algal floway and where the second sink comprises opening on base of the second sink for draining algae culture from the algal floway to the algal cultivation reactor; substrate on the horizontal surface of the tub; and membrane on a surface of the substrate, where the membrane supports the attachment and entrapment of algae; and pump (4), where the pump circulates algae culture from the algae cultivation reactor through the AGF floway structure. An INDEPENDENT CLAIM is included for method of harvesting algae biomass involving circulating culture water from an algae cultivation reactor through AGF system comprising substrate and membrane, where localized flow turbulence causes algae in the culture water to attach to the surface of the membrane; draining the culture water back into the algae cultivation reactor; and harvesting the algal biomass from the membrane.    DESCRIPTION OF DRAWING(S) - The figure shows schematic diagram of an AGF system.    Algal pond (1)    Direction of algae culture movement (2)    Paddle wheel (3)    Pump (4)    AGF mat (5)    Sinks (6)