Raw water enters the filter and is channeled to the filter top, and falls on a bed of filtration medium. Water gets filtered from up to down under pressure while traveling across the filter bed.

The filtered water then exits through laterals at the bottom of the filter and the trapped dirt on the filtration medium is removed via periodic backwashing and infrequent medium replacement.

Water filters are usually placed after the biological treatment process as the tertiary treatment process to further purify the treated outlet water.

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