THIS $4 DESALINATION DEVICE PROVIDES DRINKING WATER FOR THE WHOLE FAMILY- China
So far, the prototype system has worked in the lab for at least a week without accumulating salt. The next challenge is to scale it to something more practical, butâŠ
Researchers at MIT and in China have improved the old-fashioned solar still with a new inexpensive device that harnesses the sun to remove salt from water.
The key to this new technique is black paint and polyurethane with 2.5-millimeter holes drilled in it. The idea is that warmer water above the insulating medium causes the salt to concentrate in the cooler water beneath [âŠ]