Installation Operation Maintenance Manual
BIRM WS1 NOV 2007 \page
Manganese from precipitating. In normal circumstances the Chloride level in the
raw water should be less than 100 ppm and ideally below 50 ppm.
Bac k w as h : W hi l e the B irm s ys te m i s d e sig ne d t o op era te and
backwash at twice flow rate, it essential that there is sufficient pressure and
volume of water at the recommended backwash flow. It may be necessary to fit a larger
backwash flow button, or even a higher flow valve on larger systems if the pressure
is low, just to achieve the required cleaning of the filter bed. Alternatively a longer
backwash may be needed to achieve the same effect.
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