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• Open the air release valve by turning the
thumbscrew on the back of the pressure
gauge housing counterclockwise. Do not
remove the thumbscrew. See Figure 5.
5.
Follow steps 10-14 from Startup and Operation
section, Startup.
6.
After the pressure gauge has stabilized, turn the
gauge ring so that the arrow next to the word
"clean" aligns with the needle of the gauge.
• Record this initial "CLEAN" pressure. This
reference will be necessary in the future.
• As the filter cleans the water and the sand
begins to clog, the pressure will increase.
• The ring indicates an increased pressure of
between 10 and 12 psi above original starting
pressure.
• When the needle of the pressure gauge aligns
with the arrow next to the word "dirty", it is
time to clean the filter.
• Ensure pump speed remains the same when
recording "CLEAN" and "DIRTY" pressure.
4.2.1 Filter Cleaning
After 48 hours of operation on a new pool, the
filter should be backwashed to clear out plaster
dust and debris from the pool construction. It is
not recommended to backwash the filter on a
timed basis, e.g. once a month. Pool, weather,
dust conditions and pool occupancy all affect the
frequency of the need to backwash.
Backwashing a filter too often will actually diminish
the filter performance by limiting its ability to catch
finer particles. Do not run your system 24 hours
a day, day after day. Allowing the filter to stop
periodically will allow slight disturbance of the "mud-
deck" at the surface of the sand bed. This will lower
the running pressure slightly after rest.
Backwashing your filter is required when the
pressure gauge reading shows an increase of 10 to
12 psi above the "CLEAN" filter pressure. Another
indicator of the need to backwash is when the flow
back to the pool is reduced by 30% compared to the
clean filter flow amount.
1.
Turn the pump off.
2.
Ensure suction piping and backwash piping is
open to ensure unobstructed flow through the
filter and backwash line.
Page 14
Jandy
Sand Filter SFSM | Installation & Operation Manual
®
3.
Set the backwash valve to the "Backwash"
position.
• If a multiport valve is used, set handle to the
"Backwash" position indicated on the dial.
• If a slide valve is used, push the handle down
to the backwash position and turn the handle
to lock it in place.
4.
Stand clear of the filter and start the pump.
5.
Backwash the filter for 3 to 5 minutes or until
water runs clear.
6.
Turn the pump off.
7.
If the multiport valve has a "Rinse" position do
the following:
• Set the selector handle in "Rinse" position.
• Run for one minute. This helps settle the
sand bed.
• Stop the pump.
8.
Set backwash valve to normal operation
position.
• If a multiport valve is used, set handle to the
"Filter" position Indicated on the dial.
• If a slide valve is used, pull the handle up to
the filter position and turn the handle to lock
it in place.
• Make certain all inlet and return lines to the
pool are open to allow free movement of
water.
• Open the air release valve by turning the
thumbscrew on the back of the pressure
gauge housing counterclockwise. Do not
remove the thumbscrew. See Figure 5.
9.
Follow steps 10-14 from Startup and Operation
section, Startup.
10. Align the gauge ring according to Step 6 from
Startup and Operation section, Operation.
11. If the pressure gauge after the backwash
procedure indicates more than 5 psi difference
above that reading, it will be necessary to
chemically clean the sand bed. See next
section.
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