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Home-pool filters
Backwashing system
The plaster on a new pool can clog the sand filter with plaster
dust, which often occurs when different tests are performed on the
filtering system and other systems of the pool. The plaster dust is
very fine and can build up and block the sand bed which will inhibit
the filter cycle. If you have a new swimming pool, you may need to
conduct a backwash procedure two to three times longer than you
normally would in order to clear the dust out of the sand bed.
There are several indications to alert you when it is time to
backwash; the pool water may be murky or cloudy. Many factors can
affect the pool water such as the number of people who have been in
the pool, as well as algae, and dirt and debris that have been blown
into the pool by the wind.
A better indication of when it is time to backwash is by looking at
the readings of the pressure gauges. You ought to backwash when the
pressure increases from the initial post-backwash readings by 8-10
psi. To monitor the filter cycles, you should maintain a record of
the running pressure, or you can mark the pressure gauge after a
backwashing has been completed.
When the filter media is clean, only minor pressure disparities will
be indicated, such as 8 psi, if the system includes inlet and outlet
pressure gauges. When the dirt is accumulated in the sand bed, the
disparity will increase. If the pressure differential becomes 18-20
psi, you should backwash.
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