Chlorine is the most commonly used method for disinfecting pool water. Not only does chlorine destroy bacteria, but it also removes organic impurities not retained by the filter. This method of disinfection is safe, effective and represents an excellent value for your money. It is recommended that a chlorine value of 0.5 to 1.0 mg / L be permanently maintained in the water. This value, as well as the pH value, must be checked weekly.