As the planet earth sees more and more humans living on its surface, some of its resources might become more polluted or worse, difficult to find. That is why waste water treatment plants are extremely important for the future of our kids and grandchildren. No one would want them to drink unclean water during their lifetime. Some major investments are needed just about everywhere but that's only because man's survival is at stake. A water treatment plant makes sure the water we drink is good for our health and that no chemical will alter our body nor our genes. So water filtration is really a major priority, not just for third world countries for for the whole planet. We can now find an indoor water park somewhere near major cities and in order to save water, it is recycled and used over and over to avoir spoiling huge quantities. Water purification might be a huge business in the near future.