In a sand filter water passes through the pump housing and enters the filter through the
multiport valve head, which controls the directional flow of the water.
As water passes
through a bed of filter sand (silica quartz) dirt is trapped in the sand bed and clean
filtered water is returned to the pool.
As with all filter systems, your sand filter should run
8 to 12 hours a day. When the filter becomes dirty- pressure builds in the sand filter and
the water flow returning to your pool decreases.
When you initially start your sand filter
you will want to make a mental note of the “normal” or “starting pressure”, when the reading
increases 7-10 psi above that normal starting reading you should clean the sand by backwashing
the filter. Backwashing involves reversing water flow through the filter and sending dirt through a
waste line. A valve on the filter tank will direct the water to control backwashing and other functions.
The following are GENERAL guidelines for operating a sand filter. Specific instructions on the
operation of your filter model can be found on the following page.
REMEMBER NEVER CHANGE VALVE POSITIONS WHEN PUMP & MOTOR IS RUNNING
- This is the process by which the water from the pool passes through the
filter tank and the sand. As the water trickles down through the sand, the dirt and debris are
trapped by the sand, thus filtering the water. The filter should run 8-12 hours a day.
- This process is used to clean
the debris that has accumulated, out of the sand. The
water is essentially moving in a reverse fashion. This
should not be done for more than one minute at a time,
and should be done when the flow of water back to the
pool has slowed considerably and the pressure gauge
has doubled the original normal starting pressure.
- This is done after backwashing to
settle the sand & cloudy water inside the tank caused
by backwashing, so sediment won’t pass back into pool.
- Water is passed from the
skimmer to the pump and then up to the valve; however,
instead of passing through the sand, it passes through
the valve head and then back into the pool. Re-circulate
is used to circulate chemicals without filtering; this will
simply circulate the water throughout the pool.
- this function is used when one desires to draw water or vacuum debris
from the pool directly onto the ground (bypassing the tank). For example, if there is a lot of
debris accumulated on the floor of the pool, one would use this process to vacuum it from the
pool onto the ground; bypassing the filter tank.
- this position is used when one wishes to shut off water flow through the
valve. The valve is left in this position for winterizing, since it shuts off all of the passageways
through the valve.