Why? It is fun to play with water and solar-energy With your contribution you might help someone else that needs clean water You could find a friend on the other side of the world A cheap reliable source of clean water can contribute to world peace In many cases the rich steal water from the poor! / USA vs Mexico / water conflicts / water disputes Even extreme atmospheric water-catching is environmetally safe It is rain-making on the ground. Excessive pumping or building dams can damage nature.
How? Ask your teacher in school Building a water catcher as a school project makes school more interesting It is about physics, geography, math, chemistry, biology, agriculture, communication, language, antropology, ethics, politics, culture, climate, internet, drawing and drinking ;-) Anyone can join this challenge Kids, Farmers, Inventors, Schools, Soccer Teams, Rocket scientist, Cooks, Captains of Industry. Choose your category ( low cost / village / city / hitec / fun / portable ) Try to break a new record in efficiency or simplicity. All categories are equally important Give your watermaker a nice name Remember that co-operation could lead to better results than secrecy. Use environmentally friendly materials, recycled recyclable No polluting products or toxic chemicals
Categories & example ideas
	low-tech from natural, recycled or found materials	Solar stills and dew pitts for surivival
	Portable under 10kg	Watercone 1.0 to 1.7 Liters of condensed water per day from salty or brackish Water (might work to dehydrate absorbent)
	Small 1-2 m2 space, less than 3 m high
	Family could be build by a small group	Idea: Green-house-roof: small green plants collect water from a hydrophyl zeolite-loaded soil on a roof. Under the roof, fresh air can flow at night to moisture the soil. Plant roots will transport water to the leaves where it will evaporate during the day. Condense will form under air tight foil or glass cover.
	Hi-tec to show off or get your brand name in the news	idea: combine commercially available PV and dehumifier: challengepv1.html 4liter/day - $0.29/liter - $4300/10y idea: Use a concentrated PV-cell to power a Peltier cooler to cool a condensing coil. Use the low temperature of condensed water to precool inlet air max theoretical energy efficiency 10% ! idea: Use a solarconcentrator to power a thermoacoustical stirling engine to cool a condensor. Use the low temperature of condensed water to precool inlet air max theoretical energy efficiency 9% !
	Large scale for villages, refugee camps	idea: absorb moisture at night in zeolite, and cook it out with concentrated sunlight. Recycle heat in heat exchangers. idea: a transparent plastic dew tent is left open at night and closed tight during the day in the tent, a mix of zeolite and charcoal is put on an elevated plate of polystyreen to absorb moisture at night, and absorb sunlight during the day moisture is than evaporated and condensed on the platic near or on the ground