The principle of this type of device has been around usually as a thought experiment for years (simple electrolysis or water evap from solar power). Sadly they

The principle of this type of device has been around usually as a thought experiment for years (simple electrolysis or water evap from solar power). Sadly they have not been efficient. What they appear to have innovated on (skimmed summary only) is using newer tech to add a carbon mesh for filtration of dirt and raise the device to protect it, and allowed more sunlight through the panel to evaporate the water more efficiently. By themselves some of these things may already be patented or done in academia, but this looks like the first time I've seen them all combined in a single device. Nb. another similar device is a pool cleaner using solar to ionize the water, useful in small volumes, a few of those plus these devices may help clean small drinking pools.