NOVELTY - The culturing system comprises a circuitous member, a biofilm adhesion surface coupled to the circuitous member, an axial element, which supports the circuitous member in a circuitous travel path, and a drive mechanism operable to advance the circuitous member in the circuitous travel path. The biofilm adhesion surface couples to a circuitous member first surface and a circuitous member second surface. The culturing system further comprises a biofilm capable of adhering to the biofilm adhesion surface.    USE - The system is useful for culturing a biofilm (claimed), which is useful for culturing organisms such as algae in a suspension, and as photobioreactor systems, where the algae are useful: as a source of biochemicals for the production of nutraceuticals, health foods, food additives, vitamins, pharmaceuticals and natural dyes, an animal feed supplement, a pesticide and a soil conditioner or biofertilizer; for bioremediation and biodegradation; and as a renewable source for the production of a diesel fuel substitute including biodiesel or other biofuels such as ethanol, methane gas and hydrogen.    ADVANTAGE - The system allows the culture of algae with high yield in an economical and convenient manner.    DETAILED DESCRIPTION - The culturing system comprises a circuitous member, a biofilm adhesion surface coupled to the circuitous member, an axial element, which supports the circuitous member in a circuitous travel path, and a drive mechanism operable to advance the circuitous member in the circuitous travel path. The biofilm adhesion surface couples to a circuitous member first surface and a circuitous member second surface. The culturing system further comprises a biofilm capable of adhering to the biofilm adhesion surface. The biofilm comprises photosynthetic particles that photosynthetic organisms including algae. The biofilm adhesion surface comprises a textured material. The textured material comprises a woven fabric. The woven fabric comprises cotton and a film. The axial element engages a corresponding portion of a circuitous member surface of the circuitous member to support the circuitous member, and includes continuous and discontinuous axial elements. The culturing system further comprises a spacer element disposed between the axial element and the adjacent circuitous member surface, a driven member coupled to the axial element, a biofilm culture medium through which the circuitous member advances in the circuitous travel path, a receptacle (66)containing the biofilm culture medium, an optical filter (78) disposed to filter light incident upon the biofilm coupled to the circuitous member, a light source, which emits an amount of light incident upon the biofilm coupled to the circuitous member, a reflective surface, which directs the amount of light, a source of carbon dioxide, a source of heat, a temperature control system, a pH control system, a nitrate control system, a phosphate control system, an oxygen control system, a carbon dioxide control system, and a harvesting assembly. The circuitous member is disposed about the axial elements. The axial element is configured to dispose the circuitous member in a circuitous member configuration, which increases a surface area of the circuitous member in a fixed volume of space. The circuitous member configuration is defined by accordion folds. The drive mechanism drives the driven member fixedly or rotatably coupled to the axial element, and rotates the driven member and the axial element about a rotation axis to advance the circuitous member in the circuitous travel path. The biofilm culture medium comprises an algae culture medium. The optical filter transmits light having a predetermined wavelength of 100-150 nm, 125-175 nm, 150-200 nm, 175-225 nm, 200-250 nm, 225-275 nm, 250-300 nm, 275-325 nm, 300-350 nm, 325-375 nm, 350-400 nm, 375-425 nm, 400-450 nm, 425-475 nm, 450-500 nm, 475-525 nm, 500-550 nm, 525-575 nm, 550-600 nm, 575-625 nm, 600-650 nm, 625-675 nm, 650-700 nm, 675-725 nm, 700-750 nm, 725-775 nm, 750-800 nm, 775-825 nm, 800-850 nm, 825-875 nm, 850-900 nm, 875-925 nm, 900-950 nm, 925-975 nm, 950-1000 nm, 975-1025 nm, 1000-1500 nm, 1250-1750 nm, 1500-2000 nm, 1750-2250 nm, or 2000-2500 nm. The wavelength modulates parameters consisting of production of the biofilm, rate of growth of the biofilm, biomass of the biofilm, photosynthesis of the biofilm, production of a biochemical component by the biofilm, and carbon dioxide consumption by the biofilm. The light source comprises ambient light, sunlight, and artificial light. The carbon dioxide derives from yeast fermentation, and is derived from exhaust gas. The heat is derived from exhaust gas. The harvesting assembly comprises a shearing element. INDEPENDENT CLAIMS are included for:    (1) a method for producing a culturing system; and    (2) a method for culturing a biofilm.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a method for culturing a biofilm.    Support frame (31)    Space (52)    Receptacle (66)    Optical filter (78)    Optical filter framework. (81)