Answer:

Solids like faeces settle at the bottom and are removed with a scraper. This is the sludge. A skimmer removes the floatable solids like oil and grease. Water so cleared is called clarified water.

Explanation:

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Answer:

Solids like faeces settle at the bottom and are removed with a scraper. This is the sludge. A skimmer removes the floatable solids . Water so cleared is called clarified water. It is sometimes used in RO also.

Explanation:

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