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RAPID SAND FILTER - Coggle Diagram
RAPID SAND FILTER
Cleaning
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Accumulation of particles within filter medium lead to clogging and decrease in filtration performance
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Sand bed
Have size of 0.45-0.95 mm, bigger than the one in SSF
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Under-drainage system
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It provides uniform distribution of backwash water without disturbing or upsetting the gravel bed and filter media.
Mechanisms
Mechanical straining
Relatively large suspended particles get stuck between the sand grains as they pass the filter medium
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