According to different estimates, the proportion of fresh water in the total water quantity on Earth is 2.5-3%. According to the UN, more than 1.2 billion people live in a constant deficit of fresh water, about 2 billion people suffer from it regularly. By the middle of the XXI century, the number of people living with a constant water shortage will exceed 4 billion people. Have you ever wondered how much water flows through a dripping tap? If one drop drips every second, 4320 ml of water will be wasted during one day. Invite the plumber to fix the tap and stop the drip.