1.  Coagulation : When added to water, polyaluminium coagulants hydrolyze, forming positively charged aluminum species (polyaluminum hydroxides). These species neutralize the negative charges on suspended particles, allowing them to aggregate or "coagulate" due to reduced electrostatic repulsion between them.

2.  Flocculation : The aggregated particles then combine to form larger masses known as flocs, which are more easily removed by sedimentation or flotation processes.

3.  Adsorption : Polyaluminium coagulants also have adsorptive properties that enable them to capture and bind with impurities like color, odor-causing compounds, and pathogens.

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