Solid rain, a pseudo-clay type formulation developed by a chemical engineer, is touted as being environmentally non-aggressive since it's made of hydrogen, nitrogen, oxygen & potassium, but who really knows. A product that is not water soluble but holds lots of water for long periods of time, though I wouldn't want to try it as a thirst quencher, solid rain seems to be helpful in maintaing plant growth in periods of drought.
Here is the link to the Reuters video, Solid Rain Brings Relief to Drought Stricken Mexico:
And here is a link to an article explaining the product, 'Solid rain' could aid afforestation projects:
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