7. Your Swimming Pool Cartridge Filter
Cartridge filters consist of a tank that contains 1 or more pleated elements or cartridges where dirt and debris of 25-100 microns in size are trapped within the pleats.
Filtration starts as soon as flow is steady through the filter. As the filter removes dirt
from the pool water, the accumulated dirt causes a resistance to flow. As a result, the
gauge pressure will rise and the flow will decrease. When the pressure rises 7-10 psi
above the starting pressure, or when the flow decreases below the desired rate, clean
or replace the filter cartridge elements.
Once your filter is running and there is a pressure reading, line up the green arrow with
the current reading. (See Fig 3) When the pressure rises to or above the red or second
arrow, it is time to clean your filter. The cartridge element should generally be replaced
every 2 to 3 seasons (or when cleaning no longer allows adequate flow and reduced
Cartridge filters do not require backwashing but the cartridge element itself is removed
and cleaned, generally every 3 months or as needed. When the pressure gauge rises 8
to 10 psi above the “normal” or starting reading you should follow the steps to remove
and clean the cartridge element or follow the manufacturer’s instructions provided with
The Cartridge filter element can be cleaned by washing inside and outside with a
garden hose. After hosing cartridge, for best results, carefully brush the pleated surface
to remove fine particles. Do not pressure wash as it can damage the filter element.
You may find some debris on the cartridge pleats, which may not have been removed