That's water efficiency.Loss of nutrients through wastewater into rivers or oceans is significant form of pollution .Book now before the prices go up!You will find that retail prices are very reasonable and restaurants always have fresh fish on the menu.In our attempt at water efficiency, all water from our showers, baths, hand-basins and washing machine is redirected to a 100-litre (20 gallon) water sump in the basement of our villa.