Great idea. but….
According to their numbers the billboard makes 100 liters (roughly 25 gallons) per day. What did that sign cost? Look at the single mast mounting that must withstand high winds. Ignoring the equipment inside, the sign mount and installation is nearly $40,000. Let’s add $10,000 for the 5 reverse osmosis systems. Let’s ignore the required electricity for a moment, too. So, $50,000, for a system that makes 25 gallons per day. A system that must be managed, and maintained. A system that needs power to operate.
This is nice but will not save the world.
Here are some numbers for you. Where I live I pay $2.57 per 1000 gallons. The typical American uses 100–200 gallons of water per day. 25 gallons is a pittance.
The $50,000 might be better spent on birth control and moving the people where the food and water are. Sam Kinison