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ENGLISH
0.8 kg/cm² - 11.4 PSI: 1.3 kg/cm² - 18.5 PSI:
This
Normal pressure at the pressure indicates that it is
beginning of a filtering necessary to
“BACKWASH”
cycle.
BACKWASH
Each load of sand forms thousands of channels which
pick up all the material contained and caught up in the
filtering process, the number of free channels allowing the
water to pass is continually decreasing. This is why the
pressure rises progressively until it reaches 1.3 kg/cm
2
.
At this pressure the filtering sand is unable to collect any
more impurities and must be cleaned as follows:
Turn the selector valve to the “BACKWASH” position
and with the main drain and return valves open,
switch on the pump and run it for 2 minutes. When
this operation is completed, the dirt blocking the filter
will have been removed.
BACKWASH
BUCKSPULEN
LAVAGE-LAVADO
CONTROLAVAGGIO
