I am sorry to share this but it will be very interesting topic and I really need to know as we are facing of arsenic problem here. My question is that " How can we remove Arsenic and fluoride from water? What type of treatment should we have to follow? can Activated carbon remove it during water treatment process? I am using domestic water purifier (Brand: Pureit ) but I am not sure whether it actually remove Arsenic and fluoride. Your inputs in this regard will be highly appreciated.