Screens - Metal grills or meshes are used to remove floating vegetation, plastic and paper that would clog later processes
Sedimentation - The water is allowed to remain static to enable suspended solids such as silt to settle
Aeration - Bubbles of air/water sprays are used to aerate the water and ensure a high dissolved oxygen content.
Flocculation/Coagulation and Clarification - clay particles don't settle in the sedimentation lagoons because electrostatic charges on their surfaces cause them to repel each other. Neutralised by adding flocculants such as aluminium sulfate. They are mixed in the water then passed into the carifier tank where the particles are allowed to settle
Filtration - Filters like sand filters used to remove any remaining suspended solids and bacteria
Activated carbon filters - Particles of activated carbon are used to remove organic chemicals such as pesticides and some substances that cause bad tastes
Sterilisation - Addition of chlorine, ozone or UV exposure to sterilise water and kill pathogens
Fluoridation - Fluorides are added to water in some areas to improve the dental health of people that drink the water
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