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CLARIFICATION 7.43

Source water is used to flush the bed, taking advantage of hydraulic head already avail-
able. Waste washwater is collected in the effluent trough but is directed to a waste drain
instead of the filter. When the cycle is completed, the air is turned off, the waste drain
valve is closed, the effluent valve is opened, and clarified flow once more is directed to
the filter. No mechanical equipment is required for sludge removal, an advantage of these
units.

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