An astronaut will stay on the International Space Station (ISS) for an average of 6 months. Since they are in space, they can not resupply regularly. They need a way to clean and reuse the limited supply of water they have. The system they use has many complicated moving parts but uses the same filtration system the Kaliini Primary School uses, ultraviolet (UV) Filtration.
In November 2017, our founder has the chance to visit the Kaliini Primary School in Kenya with the nonprofit organization, Well Aware. This project catches rainwater off the roofs of the school and uses a small UV filter to clean the water. Many people have a misconception of rainwater. It is clear, so it must be clean. Imagine all of the dirt, bird droppings, and dust that collects on the roof. If not cleaned, all of that can make a person sick.
Of course, the NASA system is high tech, very expensive, and has multiple patents. They needed to create a chemical-free system that could not lead to a hazardous environment in the ISS. UV light is the best alternative because of the few moving parts. Final testing will take place in March 2018 because it is utilized in the ISS.