Shower a minute shorter, is the advice of Vitens. “During an average shower of 8.3 minutes you use about 70 liters of drinking water. That is more than half of the drinking water you use every day. By showering one minute shorter, you already save 42.5 liters per person per week That is more than 2,200 liters per year! By using a water-saving shower head, an average household saves 8,500 liters per year.”