📕 Source : OXFAM© -TB-Household water treatment and storage - ( HWTS ).

     **[<https://www.oxfamwash.org/water/household-water-treatment/TB4> Household Water Treatment Storage.pdf](<https://www.oxfamwash.org/water/household-water-treatment/TB4%20Household%20Water%20Treatment%20Storage.pdf>)**

https://www.oxfamwash.org/water/household-water-treatment/TB4 Household Water Treatment Storage.pdf

Source : OXFAM©