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What is the difference between multi grade filter and dual
media filter?
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Answer Posted / kamlesh dhatrak
Multigrade Sand Filter also consist of a vertical or
horizontal pressure vessel with a set of frontal pipe work
and valves, media consist of different sizes and grade mixed
and supported by layers of pebbles and gravels, a top
distributor to distribute the incoming water uniformly
throughout the cross section of the filter, and an under
drain system to collect filtered water.
This filter performs at a substantially higher specific flow
rate than conventional filters. The basic difference between
Pressure Sand Filter (PSF) and Multigrade Sand Filter (MGF)
are media used in vessel and velocity variation.
and
Dual media filter contain anthracite in combination with
sand supported by pebble and gravels. Theses filter consist
of a layer of anthracite (1.25-2.5mm) resting on a layer of
fine sand (1-1.5mm) Anthracite is coarse and has more dirt
holding capacity as compared to sand.
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