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2.5
Function
Jandy high rate sand filters pass unfiltered (dirty)
water through sand or sand over a shallow layer
of pea gravel. Water enters the filter at the inlet.
Unfiltered water then passes through the diffuser(s)
and moves down through the filter medium. Larger
particles are deposited at the sand bed surface and
finer particles are captured in the spaces between
the sand grains. Filtered (clean) water then returns to
the pool through the laterals.
Over time dirt and particles collected in the filter
will make it more difficult for water to pass through,
causing a rise in the operating pressure of the filter.
When this occurs it will be necessary to perform a
backwash procedure.
Remember to fill the filter halfway with water
before loading the filter media.
Diffuser
Backwash
Valve
Laterals
Backwash
Valve
Figure 2.
Filter and Backwash Function
Page 6
Filter
Free Board "F"
(See Section 3.3)
Fill to here
with water
before adding
sand or gravel
Sand or
Sand and
1"
Gravel
Backwash
Jandy
Sand Filter SFSM | Installation & Operation Manual
®
During a backwash, water is routed into the outlet
port from the filter pump. The water then moves
up through the filter media stirring and dislodging
particles and debris. The backwashed water is
forced back through the diffusers and out the inlet
port which will be routed to waste drainage.
WARNING
Use equipment only in a pool or spa installation. Do not connect
system to an unregulated city water system or other external source
of pressurized water producing pressures greater than 35 PSI.
2.6
Equipment Location
All pool water recirculation system components need
to be installed in accordance with the standards and
instructions in effect in your county or municipality.
Utmost care must be taken to ensure that the
equipment is located such that it is able to be safely
operated and maintained.
Backwash
2.6.1 Equipment Pad
The filter along with the other primary components
of your pool water recirculation system should
be installed on a level, prepared footing, which is
capable of supporting the weight of the filter and
which will accommodate the use of anchoring
Backwash
bolts to secure the equipment in place. Check local
Valve
building codes for any additional requirements.
If possible the equipment pad area should be:
• Dry.
• Well ventilated.
• Supplied with sufficient drainage.
• Out of direct sunlight.
• Located away from eaves or overhangs where
rain gutters are not installed.
• Away from overhanging trees or other foliage
that may produce waste or debris of any kind
that could clog, block or otherwise disrupt
the regular operation and maintenance of the
equipment.
• As close to the primary body of water as
possible. Additional pipe length reduces
efficiency due to pipe friction.
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