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The present invention if relates to a method for the treatment of a watery solution that contains boron, understanding the steps to prepare a colloidal phase/gelatinous active for addition of an alkaline-terroso metal or rare lands and not monobrave anion, as acid or alkaline metal salt, controlling pH in interval 7-14 and preferably in interval 8-12, with an opportune alcalinizante and preferably NaOH.