1. A composition comprising: a hydroxymethyl substituted phosphorus-containing compound selected from the group consisting of tetrakis (hydroxymethyl) phosphonium salt, C-C1-6alkyl or C-Salkenyltris (hydroxymethyl) phosphonium salt and tris (hydroxymethyl) phosphine； and polymer biguanide. 2. The composition of claim 1, wherein the weight ratio of the hydroxymethyl substituted phosphorus-containing compound to the polymer biguanide is from 17: 1 to 1: 17.3. The composition according to one of paragraphs. 1 and 2, in which the hydroxymethyl-substituted phosphorus-containing compound is tetrakis (hydroxymethyl) phosphonium sulfate. 4. The composition according to one of paragraphs. 1 and 2, in which the polymer biguanide is polyhexamethylene biguanide or a salt thereof. 5. A method of controlling microorganisms in an aqueous or water-containing system, which consists in treating the system with a composition according to one of claims. 1-4.6. The method of claim 5, wherein the aqueous or water-containing system is a system that is used or which is present in the production of oil or gas. The method according to claim 6, in which oil or gas production includes the use of injected and produced water, water sources for flooding and hydraulic fracturing, pond water, water in prefabricated tanks, functional fluids, drilling fluids, drilling fluids or fluids used for overhaul of wells, fluids for hydrotests, fluids for stimulation, packer fluids, fluids for hydraulic fracturing, oil and gas wells, separation, storage and transportation systems , Oil and gas pipelines, oil and gas reservoirs, or topliva.8. Way1. Композиция, содержащая: гидроксиметилзамещенное фосфорсодержащее соединение, выбранное из группы, включающей соль тетракис(гидроксиметил)фосфония, соль C-Cалкил- или C-Салкенилтрис(гидроксиметил)фосфония и трис(гидроксиметил)фосфин； и полимерный бигуанид.2. Композиция по п. 1, в которой массовое соотношение гидроксиметилзамещенного фосфорсодержащего соединения и поли
