Deacidification filters in water treatment plant are generally designed for back flushing to remove insoluble products caused by reaction, especially the so- called undersized particles pro- duced during deacidification. Back flushing reduces the resistance of the filter, restoring its original effi- cacy. The undersized particles mix with other contaminants and drain away with the sludge water. Deacidification plant used by smaller rural water s

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