water treatment and purification will be HUGE in the next 20 years...purified treated and bottled water will be outselling natural spring bottled water in a few decades...the only wars that will be fought over water will be technological: who can purify and bottle the cheapest...draining ground water will eventually force governments to take action and treatment and purification will be the only way to go...
the next tech giant like google or apple will be in the water purification business
it will be a corporation like no other because it will supply the most valuable product of all that will never ever go out of fashion and is consumed by 100% of the market every day for an entire life time...