What is the first stage of water treatment for a mains water supply?

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Study for the Plumbing Level 2 Cold Water Systems Test. Enhance your knowledge with flashcards and multiple choice questions for each module. Prepare to succeed in your exam!

Multiple Choice

What is the first stage of water treatment for a mains water supply?

Explanation:
Screening is the first stage because it removes large, coarse solids from the incoming mains supply. This early step protects pumps, pipes, and downstream treatment equipment from clogging, wear, and damage and makes the rest of the treatment process more effective. Once the big debris is out, water moves on to processes that handle smaller particles and contaminants, such as sedimentation, filtration, and eventually disinfection. The other stages depend on having already cleared out the large solids, so they occur after screening.

Screening is the first stage because it removes large, coarse solids from the incoming mains supply. This early step protects pumps, pipes, and downstream treatment equipment from clogging, wear, and damage and makes the rest of the treatment process more effective. Once the big debris is out, water moves on to processes that handle smaller particles and contaminants, such as sedimentation, filtration, and eventually disinfection. The other stages depend on having already cleared out the large solids, so they occur after screening.

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