State the purpose of sedimentation in water treatment.

State the purpose of filtration in water treatment.

Name TWO materials used in a filter bed during water filtration.

Describe what happens during the sedimentation stage. Include what is added to the water and why.

Explain why sedimentation alone is not sufficient to produce clean drinking water. What additional step(s) must follow?

Name the substance used in water treatment to remove unpleasant tastes and odours.

Explain HOW activated carbon removes unpleasant tastes and odours from water.

State at what stage activated carbon is typically used in the water treatment process, and what properties make it effective.

Filtration removes insoluble particles from water. What does activated carbon treatment remove that filtration CANNOT remove?

A student says: 'After filtration, the water is already clean enough to drink.' Evaluate this statement.

State the purpose of adding chlorine to the water supply.

Name the process of adding chlorine to the water supply.

Evaluate the use of chlorine in water treatment. Include one benefit and one risk in your answer.

Describe the complete three-stage process of water treatment, in the correct order. State the purpose of each stage.

[Extended Response] A water company is designing a new water treatment plant. Explain why each of the three stages (sedimentation/filtration, carbon treatment, and chlorination) is necessary, and why the stages must be carried out in this specific order.