I observed this problem in most of the houses and purified drinking water places .so much water is simply thrown into sewage canals.In houses also the drain pipe of RO left into sink that water cant be reused atleast in many houses.While RO purification in order to get 10 litres drinking water 15 to 20 litres water is coming out side.we have address this problem to save water other wise it will become big threat.At least Govt or NGO s must give wide publicity on this oroblem and how use waste water properly for planting ,house hold works etc.