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SECTION 5.
Backwashing the Filter
5A. Backwashing
1.
Turn the pump off.
2.
With filter pump
off
, set the MPV handle to
"Backwash" position.
3.
Open pressure release valve.
4.
Stand clear of the filter, and start the pump to
circulate the water backwards through the filter
to the waste line.
5.
Close pressure release valve until a steady
stream of water is moving through the filter.
6.
Backwash until water is clear.
7.
Turn
off
the pump and set the MPV handle to
the "Rinse" position.
8.
Stand clear of the filter, turn
on
the pump then
run the pump for one minute.
9.
Turn
off
the pump and set the MPV handle to
the "Filter" position.
10.
Follow the steps under 4B "Normal Operation"
to restart the system.
Caution
Be sure all provisions for waste water disposal meet
applicable local, state or national code. 100 gals. or
more of pool water will be discharged during filter
backwashing. Do not discharge where water will
cause flooding or damage.
WARNING
To avoid equipment damage and personal injury,
never change control valve handle while pump is run-
ning.
4B. Normal Operation
1.
With the pump
off
, set MPV handle to "Filter"
position.
2.
Fill the hair/lint pot, on the pump, with water.
3.
Open filter pressure release valve, stand clear of
the filter, and turn the pump
on.
4.
When a steady stream of water comes from the
pressure release valve, close the valve.
5.
With the filter/pump operating, record the initial
pressure gauge reading in this manual.
When reading is 10 to 12 psi above the initial
reading it is time to backwash the filter.
4C. Valve Operation
1.
The flow of water through a sand filter is
controlled by the multiport valve (MPV) which
comes completely assembled and ready for
operation.
2.
The handle on top of the MPV can be moved to
any of six different positions. The function of
each position is described below.
Valve Position
Function
FILTER
Normal filtration and
vacuuming.
BACKWASH
Cleaning filter by reversing
the flow.
RINSE
Used after backwash to flush
dirt from the valve.
WASTE
Bypasses filter; used for
vacuuming to waste, or
lowering water level.
RECIRCULATE
Bypasses filter for circulating
water to the pool.
CLOSED
Shuts off all flow to the filter
and pool.
Figure 2. Multi Port Valve Handle Positions (shown in
Rinse position).
RECIRCULA
TE
WASTE
CLOSED
BACKW
ASH
FIL
TER
RINSE
