Hi Kumarasamy, have a look ...

Published July 6, 2015 12:35 by Patrick Albert Grimaud, BWSC - General Manager, site Lebanon

Hi Kumarasamy, have a look at: http://infohouse.p2ric.org/ref/15/14291.pdf http://www.who.int/water_sanitation_health/dwq/HPC10.pdf Kind regards, Patrick