Figure 11

Percentage (95% CI) of samples meeting WHO guidelines for zero valent iron technologies (from sources other than BRAC (2001). AANF, Asia arsenic network filter [42]; Sono(Del), Sono [42]; Sono(Hus1) and sono(Hus2), sono for 2 filters [49]; Sono(Mil), sono [17]; Sono(Ngai), sono[23, 30]; Sono(Shaf), Sono [32].