Fig. 3.

Water purification device undergoing field trials in India and its performance evaluation. (A) Schematic diagram of the device. (B) Actual photograph of the device. Construction and assembly of the device are simple and can be done locally. The antimicrobial composition is used as granules and kept in the membrane filter. Carbon block is positioned just before the tap. Carbon block may also be used as a multilayer axial block, comprising adsorbents for specific regional contaminants such as arsenic, iron, and lead. (C–F) Column data for the removal of (C) E. coli, (D) Fe²⁺, (E) Pb²⁺, and (F) As⁵⁺. Input (i) and output (ii) concentrations are indicated in C–F.