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Get PriceSlow Sand Filter (Biological Filter) • Elements of a slow sand filter 1. Supernatant or raw water 2. Bed of graded sand (on a support of gravel) 3. Under – drainage system 4. A system of filter control valves 1. Supernatant water: • Depth varies from 1 - 1.5meters • Serves two important purposes: a) Provides a constant head of water • This overcomes the resistance of the filter bed ...
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Get PriceSlow sand / bio-sand filters ? Rapid sand/mechanical filters 76 77 Rapid sand/mechanical filters 78 Slow sand filter ? Slow sand filter was first used for water treatment in 1804 in Scotland and subsequently in London. ? During the 19th century slow sand filter spread throughout the world. Even today, they are generally accepted as the standard ...
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Get PriceBackwashing (water treatment), Slow sand filters and self-cleaning screen filters, media followed by a rinse water wash: 213–4 Backwashing continues . Washed Gravel Products - The Stone Store Washed Gravel Products The Stone Store carries an assortment of sand and gravel products for a wide variety of projects In bulk or by the bag sand and gravel is .
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