what are the limitations of purification of water using sunlight?

Water can be purified by using solar energy. Solar energy heats up the water and removes some of the volatile impurities. But there are several limitation to this method :

  • Solar energy can not remove particulate matter from the water. Also it can not remove dissolved salts, minerals and metals from water.
  •  Solar energy ( UV rays and infrared rays) though can kill some microbes but are not effective in killing all the microbes and hence can not completely purify the water.

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