Sand Filter an overview | ScienceDirect Topics
The homogeneous sand filter has a –1 m deep bed and typically of – mm of sand (effective size mm) placed on a 50 mm layer of 4–8 mm or 75 mm of – mm gravel. Homogeneous sand of effective size up to mm has also been used. The stated size ranges for sand and gravel are generally 5 and 95 percentiles.