WATER PURIFICATION- A NEW SOLAR STILL

A 'solar still' is among the oldest water purifying devices used to distil potable water from saline or brackish water.

- Ajay Sukumaran

The method is simple-it uses the sun's heat to evaporate saline water and collects the purified water via condensation.

While electricitypowered reverse osmosis (RO) systems, which push impure water through membranes at high pressure, are now the popular way of filtration, there has been substantial interest in improving on lowcost, passive desalination systems such as the solar still over the past decade.