Micropur Classic is a preservative for clear water, based on silver ions which prevent any germs from forming in the water. The water can be stored for up to 6 months. Use 1 tablet for 1 litre of water. Leave the product to dissolve for 10 minutes then shake well so that the active principle can be distributed in the water. Let stand for 2 hours before drinking. Store the closed water tanks away from direct sun rays. Avoid metal containers.