NAIROBI, July 17 (Xinhua) -- As he crisscrossed African cities and villages to market the Tecno smartphone, Zhong Yanxiong, 34, came face-to-face with clean drinking water challenges rampant in the continent. Zhong has lived in Africa for six years and it was during his interaction with both rural and urban families that he realized that access to safe drinking water remained a mirage, and only novel innovations could offer a respite. The co-founder and chief executive officer of iClear Wellife Service Limited, a start-up company based in Nairobi, the Kenyan capital, is on a mission to revolutionize water treatment by...