When your body is under attack from invading organisms its first line of defence is the hypochlorous acid white blood cells produce to fight infection.
Among your white blood cells are:
Monocytes. They have a longer lifespan than many white blood cells and help to break down bacteria.
Lymphocytes. They create antibodies to defend against bacteria, viruses, and other potentially harmful invaders.
Neutrophils. They kill and digest bacteria and fungi. They are the most numerous type of white blood cell and your first line of defence when infection strikes.
Basophils. These small cells appear to sound an alarm when infectious agents invade your blood. They secrete chemicals such as histamine, a marker of allergic disease, that help control the body's immune response.
Eosinophils. They attack and kill parasites, destroy cancer cells, and help with allergic responses.
All the above produce HOCl which is a more powerful oxidiser than chlorine and a very effective sanitising agent.