SFG SERIES TOP MOUNT FIBREGLASS MEDIA FILTER INSTALLATION AND OPERATION MANUAL
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5.
MULTIPORT CONTROL VALVE FUNCTIONS
The Multiport Control Valve controls the direction of water flow throughout your filter allowing you to
easily filter your swimming pool water and then clean your filter tank. Correct operation of the Multiport
Control Valve will give you healthy, clean water for many years.
1) FILTER
Normal Filtration and Vacuuming
This is the standard position when your filtration system is in normal
operation. The water flows in from your pool and is distributed across the top
of the media bed in the filter. Through pressure this water is pushed down
through the Media allowing debris to be removed from the water and collected
in the media bed. Water is then taken up through the laterals and the centre
stem pipe and returned to the pool, usually via some form of sanitation and/or
heating. The filter position can also be used for manual vacuuming and
cleaning of small debris.
2) BACKWASH
Cleaning filter by reversing the flow
This position is used when the media bed requires cleaning. Use the Pressure
Gauge to indicate when this is required, usually 10 PSI or 70 kPa above
operation of a clean filter. When backwash is selected the water flow is
reversed and goes down the stem pipe and out through the laterals. This lifts
the media bed and allows debris to be taken up the filter and out through the
waste pipe. The sight glass will show the quality of the water and you need
to backwash until this water is clear.
3) WASTE
By-passes filter, used for vacuuming to waste or lowering water
level
The waste position allows you to pump excess water from the pool directly
down the waste pipe. This position is useful after heavy rains where the water
level is too high. Water is directed straight through the Multiport Control Valve
and bypasses the filter, going directly to waste. You can also use this position
to vacuum heavy concentration of debris from the pool.
4) RECIRCULATE
By-passes filter for circulating water to pool
Similar to the Waste setting, recirculate allows the water to bypass the filter
but goes straight back to the pool. This is a useful setting if you have applied
some chemicals that need to be circulated, but not removed by the filter. In
addition, if a leak develops in the filter use recirculate to continue circulating
water until it is fixed. The recirculate setting can also be used to assist with
the re-priming of the filter pump, as bypassing the media bed reduces the
resistance in the pump return circuit.
5) RINSE
Used after backwash to flush dirt from valve
Rinse is a very important setting to use after you have completed the
Backwash cycle. In the rinse setting, water is taken from the pool and
distributed on the media bed. This downward flow settles the media bed after
backwashing and carries any remaining loose dirt through to the waste line.
By using Rinse after Backwashing you will eliminate any debris returning to
the pool water. Rinse until you see clear water in the sight glass and should
take half the time of a Backwash cycle.
6) CLOSED
Shuts off all flow to filter or pool
Closed setting acts like a valve and prevents flow of water through the tank,
particularly useful if doing any maintenance on the filtration system.
