NOVELTY - Forming algal-based biofuels involves growing cultured algae in culture water in algae growth unit (10); supplying harvested algae to filtration unit comprising harvesting chamber (22) containing sieve having pores sized to maintain algae in the chamber while allowing culture water to exit from it, unit to force culture water via sieve and into reservoir, and unit to remove algal biomass as culture water has exited the chamber; removing culture water and biomass; suspending biomass in solvent; separating suspended biomass into water and oil phase; and processing oil phase.    USE - For the production of algal-based biofuels (claimed) (such as biodiesel, bioethanol and hydrogen gas).    ADVANTAGE - The method produces biofuels in a cost-effective and energy efficient manner, by using algal growth unit having high production rates, control contamination, efficient re-cycling of the culture media, amenable to scaling to very large scale production operations, low external energy input and efficient use of solar energy. The solid product obtained by the method is used as animal feed. The growth unit is fully capable of utilizing energy from renewable sources such as solar, wind and geothermal energy. The system has a higher photon conversion efficiency, can be harvested batch-wise nearly all year round, utilizes salt and waste water streams to greatly reduce freshwater use, couples CO2-neutral fuel production with CO2 sequestration, produces non-toxic and highly biodegradable biofuels, has low costs which is associated with the harvesting and transportation of microalgae as compared to tree or terrestrial crops, and grows algae under conditions which are unsuitable for conventional crop production.    DETAILED DESCRIPTION - Production of algal-based biofuels involves growing cultured algae in culture water in an algae growing unit (10); harvesting the algae; supplying the harvested algae to a filtration unit comprising a harvesting chamber (22) containing a sieve having pores sized to maintain algae within the harvesting chamber while allowing culture water to exit the harvesting chamber, unit for forcing the culture water through the sieve and into a culture water reservoir thus leaving an algal biomass in the harvesting chamber, and unit for removing the algal biomass from the harvesting chamber once the culture water has exited the harvesting chamber; forcing the culture water to exit the harvesting chamber thus leaving an algal biomass in the harvesting chamber; removing the algal biomass from the harvesting chamber once the culture water has exited the harvesting chamber; suspending the algal biomass in a solvent; separating the suspended algal biomass into a water phase and an oil phase; and processing the oil phase. INDEPENDENT CLAIMS are included for the following:    (1) a facility for sequentially processing alga to produce a variety of products comprising an algae growing unit configured to grow cultured algae in culture water; a filtration unit configured to separate the cultured algae from the culture water; a solvent unit configured to suspend the separated cultured algae in a solvent; a phase separation unit configured to separate the suspended algae into an oil phase and a water phase; and an oil product processing unit configured to produce glycerin, biodiesel, and highly unsaturated fatty acids from the oil phase; and    (2) a filtration unit (u1) for processing of algae grown in culture water, comprising the harvesting chamber; the unit for forcing the culture water; and the unit for removing the algal biomass.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of terraced wall algal growth unit.    Algal growth unit (10)    Terraces (12)    Sloping panels (14)    Central channel (16)    Algal sieve unit (22)