what's that thing they invented for the developing world where you put it on a dirty lake and the sun rays evaporate the water and it goes up and into a container and it's clean
user
Are you thinking of a solar still? Forms of it have been around since the Inca Empire, but there have been recent iterations targeted for remote areas with frequent or severe droughts.
assistant
are there other solutions like that ? the name doesn't ring a bell
user