Not sure what you are commenting on here - this article is a review of three different types of technology used to pull water from the air. I found the discuss

Not sure what you are commenting on here - this article is a review of three different types of technology used to pull water from the air. I found the discussion far more interesting than this dismissal suggests they would be, in particular: - improvements in dehumidifier tech, - development of new dessicants that will potentially be more efficient then dehumidification, and - new fog-catcher designs (fog catchers are already used as reliable water sources) There are a number of different companies mentioned, some of which have dubious claims, so maybe one of those is the scam you are referring to? The article seemed balanced to me, not promoting any one company or technology with outlandish claims. It leads in to the discussion by saying "the majority of these devices operate in the same way as mechanical dehumidifiers", differing in two major ways two major ways: Firstly, robustness – water harvesters are designed to be operated 24/7, rather than to cycle on and off. Secondly, drinking water quality controls are built into the machines. ‘The coil is coated with a food grade coating so that the water that’s collected isn’t exposed to metal contamination, and the air filter is a much higher quality than in a dehumidifier,’ And then it immediately jumps into why this is generally a Bad Idea But even though this dehumidifier-like water harvesting technology has been around for a while now, ‘the market is still very small’, explains Ruzhu Wang, a professor of refrigeration engineering at Shanghai Jiao Tong University in China. ‘The reasons are high energy consumption and initial investment costs,’ he adds. Another issue is water capture efficiency; especially in dry, desert conditions where a water harvesting technology might be most needed. The atmosphere must be humid for useful volumes of water vapour to be able to be sucked up using these tools. This is an area that seems to attract extravagant and unrealistic claims, but I don't think that accusation holds up agains this article.