How does water purification device benefit people?

Answer:

Much of the world does not have access to uncontamined freshwater. If contaminated water is rendered safe or if salt-water could be efficiently purified, this problem would soon be relieved.

First answer by Aquaintanceofthestate. Last edit by Aquaintanceofthestate. Contributor trust: 23 [recommend contributor recommended]. Question popularity: 3 [recommend question].