Half a capful (150g/50,000 L ) every second day or as often as needed to maintain a chlorine residual of 1 3ppm. Sanitiser, Clarifier, Water enhancer, Algae killer & Oxidiser. Long lasti ng maintenance chlorine for healthy, clear water. Apply anytime, day or night. Saves money. Less pool acid required. Works immediately and leaves no residue. Removes unfilterable swimmer waste, eliminates dull cloudy water.