A system for producing a product or products employing microalgae, wherein said system comprises: a) means for producing a microalgae culture, comprising said means: a1) a plurality of closed productive units, except for gas outputs, comprising the microalgae culture having each of said productive units a maximum height of 2 m, wherein said plurality of productive units are vertical flat-plate parallel units made of transparent material; a2) means for generating turbulence of a gaseous fluid and for feeding thereof to the culture; a3) a structure for shaping and giving stiffness to the productive unit; a4) connective elements between the productive units; b) a system control unit connected through narrow section capillaries to the top of the plurality of productive units and with a slope from 1 up to 10° thereover, comprising a plurality of probes and connective elements for emptying and filling by overflowing said productive units; c) a cell system located outside of the productive unit and provided with two photodiodes which are an emitter cell and a measuring/receiver cell, wherein the productive unit is positioned between the two photodiodes and wherein the emitter cell and the receiver cell must be face to face, and wherein said photodiodes take the control of the oscillations of light inside the productive unit so that depending on the light passing through the productive unit, the culture will be more or less concentrated, further comprising one or further receiver cells to measure the environmental light; d) means of artificial and/or natural lighting; e) means for transforming and/or extracting said product or products comprising at least one of the following: - means for mechanical separation; - means for washing with water; - means for drying; - means for breaking the microalgae; - means for purifying; - means for extracting with or without solvents. a) means for producing a microalgae culture, comprising said means: a1) a plurality of closed productive units, except for gas outputs, comprising the microalgae culture having each of said productive units a maximum height of 2 m, wherein said plurality of productive units are vertical flat-plate parallel units made of transparent material; a2) means for generating turbulence of a gaseous fluid and for feeding thereof to the culture; a3) a structure for shaping and giving stiffness to the productive unit; a4) connective elements between the productive units; a1) a plurality of closed productive units, except for gas outputs, comprising the microalgae culture having each of said productive units a maximum height of 2 m, wherein said plurality of productive units are vertical flat-plate parallel units made of transparent material; a2) means for generating turbulence of a gaseous fluid and for feeding thereof to the culture; a3) a structure for shaping and giving stiffness to the productive unit; a4) connective elements between the productive units; b) a system control unit connected through narrow section capillaries to the top of the plurality of productive units and with a slope from 1 up to 10° thereover, comprising a plurality of probes and connective elements for emptying and filling by overflowing said productive units; c) a cell system located outside of the productive unit and provided with two photodiodes which are an emitter cell and a measuring/receiver cell, wherein the productive unit is positioned between the two photodiodes and wherein the emitter cell and the receiver cell must be face to face, and wherein said photodiodes take the control of the oscillations of light inside the productive unit so that depending on the light passing through the productive unit, the culture will be more or less concentrated, further comprising one or further receiver cells to measure the environmental light; d) means of artificial and/or natural lighting; e) means for transforming and/or extracting said product or products comprising at least one of the following: - means for mechanical separation; - means for washing with water; - means for drying; - means for breaking the microalgae; - means for purifying; - means for extracting with or without solvents. - means for mechanical separation; - means for washing with water; - means for drying; - means for breaking the microalgae; - means for purifying; - means for extracting with or without solvents.