Helping more people around the world to have access to safe drinking water is one of the greatest challenges of the 21st century.
But a company from Carmarthenshire are aiming to improve the situation, with their pioneering technology for purifying water.
The technology takes three minutes to clean the water. We've sped up that process for you in the video below, so you can see how it works.
More top news
A cold night with a yellow warning in force for snow and ice. Winds will remain strong but a largely dry and bright day tomorrow.
In the first of our specials looking at the Welsh education system, we visited a new primary school in Llanelli.
A six-part series following the lives of the people who live and work in the shadow of Snowdon, one of the busiest mountains in the world.