This is an awesome way to water your garden plants in a dry climate or where you have access to sea water. The plants are watered by solar drip condensation so the salt in the water doesn’t harm the plants. You also only actually have to add water occasionally.
The sun heats the water it condenses and collects then drips into the soil. Mulch is used to slow evaporation and you only need to add water when the water container get low. According to the article you can “Grow vegetables with 10 times less water with solar drip irrigation”. This would work well where is is really dry. Check out the instructions and video on Homestead Lifestyle .