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A shop in the Gyadi Gyadi area of Kano Nigeria prominently displays a Waterguard advertisement on the door.  Waterguard is a chlorine-based product that makes water safe to drink.  It is distributed by the Nigerian NGO, the Society for Family Health (SFH), through social marketing.  SFH is the largest indigenous NGO in Nigeria and is the Nigerian partner of the US-based international NGO, Population Services International.