valve and ball valve are closed, the pressure manometer on precoat filter side
shows approx. 3 - 4 bar. The ball valve at the sludge outflow hose is opened
suddenly and remains open for approx. 5 sec., then close slowly. This process must
be repeated 6 times. The rinsing water flowing off the sludge outflow hose must then
be clear. The sludge discharge hose must be held on to during the backwashing
process or it has to be tied-up.
Switch-off pure water pump, let ball valve of the sludge outflow hose open, open de-
aeration valves and uncouple circulation hose at the circulation outlet and hold until
precoat filter is empty.
The precoat filter is backwashed and can be started again as described under item
IV 1.3.2.
Complete backwashing should not exceed 4 - 6 min.
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