The Pressure sand filter is now taken out of
service and cleaning of the filter is effected by flow reversal. To
assist in cleaning the bed, the backwash operation is often preceded by
air agitation through the under drain system. The process of air
scouring agitates the sand with a scrubbing action, which loosens the
intercepted particles. The filter is now ready to be put back into
service. Picture Low Flow PSF (FRP Vessel) and High flow custom Vessel
(MS Vessel) Sand filter - Sand filters are used for water purification.
There are three main types; All three methods are used extensively in
the water industry throughout the world.
Also the isolating ball
valves could be partially turned off or blocked with debris, or even a
blocked filter basket in the pump to a blocked pump chamber or impellor
inside the pump, or finally a restricted inlet to the multiport fitted
to the filter. Further investigation will be needed to find the reasons.
If the plantroom is below water level, make sure you can isolate the
pool totally including any returns and that the ball valves are
installed in the correct direction. If the pump appears to be the
problem and you need help with your investigations, please use the
Contact Page to book an appointment for a PSP engineer to visit. To
obtain more information on the PSP Pool Owners Club, please visit the
Members Page. The information on this page will be added to the
appropriate section for members future searches.

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2011-08-15

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