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"The researchers estimate that if the system is scaled up to the size of a small suitcase, it could produce about 4 to 6 liters of drinking water per hour and last several years before requiring replacement parts. At this scale and performance, the system could produce drinking water at a rate and price that is cheaper than tap water."
Holy eff, I was expecting "per day" after 4-6 liters from a suitcase size device... That's more water than I consume in a day, even on double flush days. Of course it would only be during daylight, and with full sun I imagine. But that's still so much water!
While this is a cool development I would recommend tempering expectations. The cost of tap water is exceptionally cheap and the claims made here likely take these estimates to the extremes. The economics of scale likely don't match up.
For example, tap water in my city costs ~$0.04 per gallon, at 5 liters per hour, 0.264 gallons per liter, 24 hours per day, for 5 years is $2,312. So saying they can make it for less than the cost of tap water doesn't mean it's affordable.
EDIT: Forgot to convert from liters to gallons
5 gallons per.hour? The article says 4-6 litres - a little over a gallon.
Great point, sorry for the error!