Very useful product specifically for the rural area! nice hunt.
Pros:-

• This gadget works on a simple process of electrolysis of water+salt,so you need just the water (which has to be clean),
  Salt and electrical supply.
• The electrolysis converts the sodium chloride into active chlorine which can destroy the microorganisms present in the water.
  Cons:-
• in most of the rural areas there's lack of electric supply.