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Dear sea friends: According to the \"Catalogue of Highly Toxic Chemicals\" (2015), liquid chlorine is included in this catalogue and has been explicitly classified as a \"highly toxic chemical\". Article 24 of the Regulations on the Safety Management of Hazardous Chemicals (Decree No. 591 of the State Council) stipulates that for \"highly toxic chemicals\", a system of \"double-person handling and double-person storage\" shall be implemented ； Paragraph 4.4.5 of the \"General Rules for the Storage of Commonly Used Hazardous Chemicals\" stipulates that \"highly toxic chemicals\" should be subject to a \"five-dual\" management system (double verification, double custody, double dispatch, double locking, and double record-keeping) ； However, at present, most chlor-alkali enterprises still do not implement a system of \"two persons for receipt and dispatch, and two persons for storage\" for liquid chlorine cylinders (when full), let alone a \"five-pairs\" management system. We welcome colleagues in the chlor-alkali industry to participate in the discussion: 1. Is it necessary to implement a \"five-pair\" management system for the liquid chlorine cylinders (full cylinders) used by chlor-alkali enterprises? 2. If it is deemed unnecessary to implement the “five pairs” management system, how should the reasons be explained to the relevant inspection departments (safety experts)? 3. If it is deemed necessary to implement the “five pairs” management system, how should chlor-alkali enterprises put this system into practice?