The presence of chlorine in drinking water is important, but how much of that substance should be there? Is there not a minimum quantity to consider? Is there a maximum?
The presence of chlorine is important in water to assure the good disinfection and as residual to prevent contamination in the distribution network. Therefore, there should always be a certain quantity of chlorine in distributing water, in water that arrives at the houses, and water that the users drink. The minimum residual level must be 0.5 mg/L of chlorine per liter of water, even though, there are other related demands that must accompany that concentration, such as the minimum contacting time, turbidity, and the pH of water. At the maximum level it is estimated that the threshold is 5 mg/L. This has sanitary reasons, but also because users detect lower levels by taste and smell. Generally, when the value of 5 mg/L is reached there have already been complaints and refusal to drink the disinfected water. 27. What country is the most efficient in water treatment and in water consumption? Sudan has a very low consumption rate per capita. Does this mean a national awareness about the i
