How do we turn raw water into clean drinking water? Take a closer look at the key stages of the water treatment process, and appreciate the work that goes behind every drop.
Stage 1: Coagulation & Flocculation
In order to bind small floating particles together, coagulants such as polyelectrolyte and aluminium sulphate are added into the water. Silt, sand and other suspended matter “flocculate” to form larger and heavier clumps.
The water then passes through rapid sand filters or membranes to remove finer residual particles of up to 0.02 microns. As a comparison, the thickness of a strand of human hair is around 50-120 microns.
In this final stage, the water is disinfected with chlorine or ozone to ensure that no harmful bacteria or viruses are present. The disinfection is carried out in accordance with World Health Organisation’s guidelines.