A method for cyanobacteria removal in an aqueous solution, comprising the following main steps: - a first main step of determining a percentage of coagulable dissolved aromatic organic matter to remove corresponding to a cyanobacteria percentage concentration to remove; - a second main step of determining an optimal coagulant dose corresponding to the determined percentage of coagulable dissolved aromatic organic matter to remove and; - a third main step of applying said optimal coagulant dose as the adjusted coagulant dose for cyanobacteria removal; the method comprising, prior to the main steps , the following preliminary steps: - a first preliminary step of determining the cyanobacteria concentration percentage to remove; - a second preliminary step of measuring the turbidity of the aqueous solution; - a third preliminary step of measuring the dissolved aromatic organic matter of the aqueous solution; - a fourth preliminary step of identifying for the aqueous solution a category among at least two categories of water according to the measured turbidity and dissolved aromatic organic matter of the aqueous solution, each category of water being determined according to a couple of values of turbidity and dissolved aromatic organic matter, each category of water providing a relation between the percentage of cyanobacteria concentration to remove and the percentage of coagulable dissolved aromatic organic matter to remove; the first main step using said relation and the determined cyanobacteria concentration percentage to remove. - a first main step of determining a percentage of coagulable dissolved aromatic organic matter to remove corresponding to a cyanobacteria percentage concentration to remove; - a second main step of determining an optimal coagulant dose corresponding to the determined percentage of coagulable dissolved aromatic organic matter to remove and; - a third main step of applying said optimal coagulant dose as the adjusted coagulant dose for cyanobacteria removal; the method comprising, prior to the main steps , the following preliminary steps: - a first preliminary step of determining the cyanobacteria concentration percentage to remove; - a second preliminary step of measuring the turbidity of the aqueous solution; - a third preliminary step of measuring the dissolved aromatic organic matter of the aqueous solution; - a fourth preliminary step of identifying for the aqueous solution a category among at least two categories of water according to the measured turbidity and dissolved aromatic organic matter of the aqueous solution, each category of water being determined according to a couple of values of turbidity and dissolved aromatic organic matter, each category of water providing a relation between the percentage of cyanobacteria concentration to remove and the percentage of coagulable dissolved aromatic organic matter to remove; - a first preliminary step of determining the cyanobacteria concentration percentage to remove; - a second preliminary step of measuring the turbidity of the aqueous solution; - a third preliminary step of measuring the dissolved aromatic organic matter of the aqueous solution; - a fourth preliminary step of identifying for the aqueous solution a category among at least two categories of water according to the measured turbidity and dissolved aromatic organic matter of the aqueous solution, each category of water being determined according to a couple of values of turbidity and dissolved aromatic organic matter, each category of water providing a relation between the percentage of cyanobacteria concentration to remove and the percentage of coagulable dissolved aromatic organic matter to remove; the first main step using said relation and the determined cyanobacteria concentration percentage to remove. <EOS>