Section IV Availability Of Drinking Water On BoardArticle 50. Water available for human consumption shall have the microbiological, physical,chemical and radioactive parameters established as drinking water standards so as not topose risks to the human health.Article 51. Water available on board caught directly from water environments shall first beefficiently and effectively treated and checked by means of applicable monitoring and controlmethodology before it is made available for human consumption.Article 52. When treated with chlorine, the water available on board shall contain afterdisinfection a minimum content of free residual chlorine of 0.5 ppm, and at any available waterpoint said chloride content shall be kept within 0.2 ppm and 2 ppm.