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When the filter
is precoated the first time, the pressure indicated on top of the unit should be
noted and recorded. A new "clean pressure" should be recorded and used as
the baseline for filter operation following each backwash and precoat.
the purpose of the filtration system is to remove particulate matter including,
small pieces of trash, that passes through the strainer baskets. The
system also removes material like dead algae and other solids that can't be see
with the naked eye but causes cloudy water. Over time, with the
accumulation of the foreign and "invisible" matter, the pressure required to
force water through the filter leaves increases. If the system were used
for an extended period of time without regard for the increase in inlet
pressure, circulation failure or damage to the filter leaves could occur.
Removing material accumulated on the surface of the filter internals is called
backwashing and the procedure should be utilized once the filter inlet pressure
reaches a point 8 to 10 pounds higher than the pressure recorded at the onset of
the filtration period.
As the name
implies, backwashing involves reversing flow through the filter with the
backwash material going to the sewer through the pool waste line.
from the "filter" position to the "backwash" position by depressing the large
handle until the position holding tab clears the slot that holds it in position.
The large handle is plastic so just apply adequate pressure to cause the tab to
clear the ledge that holds it in place. Applying excessive pressure to the
handle can result in damage to the unit.
main circulation pumps and observe the
valve body. When the backwash begins, the contents of the glass will
change from clear to very cloudy. After a couple of minutes, the
water will become clear again.
Once the water becomes clear,
shutdown circulation and wait 5 minutes.
Restart circulation and observe the
sight glass again. This time the duration of flow with cloudy material
will be shorter. Keep repeating steps 2 and 3 until the contents of
the sight glass doesn't change when the pump is started or a maximum of 4
Now, shutdown circulation and move
the filtration valve back to the filter position using caution explained in
Start circulation pump in preparation
for precoating the filter.
Remove the cover
from either of the skimmer wells
and add 10 scoops of diatomaceous earth to the water stream.
The water stream flows to the circulation pump then through the filter where the
diatomaceous earth covers the filtration leaves.
Replace the cover to the skimmer wells, be sure to record the
"clean" inlet pressure to the filter and backwashing shouldn't be required again
for approximately 3 months with average use.
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Remove Skimmer Cover
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