Rivulis F2400 Media Filter
5. OPERATING THE FILTRATION ARRAY
After configuring the controller, the filters will be backwashed following the time and DP set.
When the array starts operating, water filtrated accordingly will be running through the
irrigation network.
The controller will send the backwash-cycle command when: the Pressure Differential sensor
detects that the head-loss reading surpass the set value, or the backwash cycle countdown
reaches zero (whichever situation takes place first).
Throughout a backwash cycle, while the array’s filters are being backwashed one after the
other, there is no interruption in the irrigation process; clean water continues to flow to the
field.
Typically, backwash time for each filter takes about 60 seconds. The intervals between
backwash cycles may extend up to 3 hours.
If the water is dirtier than average, increase the backwash time to each filter and/or decrease
the intervals time between the backwash cycles. (see Annex: “Programming the Controller")
Note: as the water quality changes during the season, the backwash time and the intervals
time between the backwash cycles, should be adjusted accordingly by reprogramming the
controller.
NOTE:
Perform a manual back-flush on the filter at the beginning and at the end of irrigation.
Back flush filter when head loss increases by 0.3 - 0.5 bar (4.5 – 7.5 psi) above head loss of
clean filter, or every 3 hours, whichever comes first.
Verify the filter head loss by checking the pressure readings at the inlet and outlet of the
media array.
It is recommended to use an irrigation controller.
For recommended flow rates for filtering and back flushing, see Table 1.
If the filter’s gravel is contaminated by organic particles, chlorination should be performed.
Chlorinate the filter at the beginning and at the end of the irrigation season.(see clause
“Chlorination”)
Image 7. Flow direction during filtration (left) and backwash (right).
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