1. The ground water must contain a high concentration of iron. (As:Fe = 1: 10 will be excellent. If that conc ratio is present, then this method will work whatever may be th level of arsenic)
2. The spray system must work properly & efficiently.
3. Small handpumps can not be used for this process. Submersible pumps working through electrical power is a necessity to achieve the desired result.
4. After drinking the arsenic & iron contaminated water for a long time, the villagers may take some time to adapt to the taste of the good quality As & Fe free water. This will need some awareness campaign. Also, absence of iron results in loose motion for a few days which can be mistaken as stomach upset.