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Home-pool filters
Backwash procedure
The process of backwashing involves reversing (hence the term
“backwashing“) the flow of water through the filter. The water goes
up
through the under-drain (or laterals) and the outlet water turns to
waste
water.
The backwashing method is quite easy to undertake. You simply turn
off the
pump so that there will not be any harm done to the plumbing or
valves.
After that, rotate the control valve to "backwash" and restart the
mechanism. The system should backwash for two to three minutes. Then
turn
off the system and reset the valves. Do not turn the system back on
immediately as the sand bed should settle down and go back into
place.
Since there may be remains of backwash effluent in the sand bed, a
spurt of
cloudy water may enter the pool when the pump is restarted. When
this
happens, it is usually due to insufficient backwash time. In order
to
alleviate this small eruption of murky water, some valves are
capable of
sending a small burst of water to waste before the filter effluent
is
returned to the pool.
Most manufacturers suggest backwashing for two to three minutes;
this is
with a general flow rate of 15 to 20 gpm per square foot of filter
area.
Before conducting a backwashing procedure in your pool or spa for
the first
time, be sure to review the manufacturer's service manual.
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