Sand Filter - an overview
The homogeneous sand filter has a 0.9–1 m deep bed of typically 0.85–1.7 mm sand (d 10 =0.9 mm) placed on a 50 mm layer of 4–8 mm or 75 mm of 6.7–13.2 mm gravel. Homogeneous sand of effective size up to 1.3 mm has also been used. The stated size ranges for sand and gravel are generally 5 …
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