What is a Cartridge Filter?

• Cartridge filters are manufactured in a range of sizes to meet the demands of different sized pools. Although the specific set of specifications can vary depending on the model, cartridge filters all work in same manner. The filters contain a pleated cartridge that looks similar to the air filters used in automobiles. This polyester material cartridge is porous enough to allow water to pass through while capturing dirt particles as small as 25 microns.
  
  

Gauge

• All cartridge filters have a pressure gauge that's usually located on the side or near the top portion of the filter. The gauge measures the pressure inside the pool filter in pounds per square inch (psi). The higher the pressure is on the gauge, the dirtier the filter is. When the pressure rises 8 to 10 psi above the normal reading the filter must be thoroughly cleaned. Once the filter is cleaned the pressure is restored to normal levels. The normal pressure gauge readings will vary depending on filter and motor size.
  
  

Construction

• The cartridge filter is connected to a pool motor that's paired according to the size of the filter and the demands of the pool. The more gallons of water in the pool, the bigger and stronger the pool motor must be. The motor provides the suction and release power to push the water from the pool skimmer through a network of hoses and the filter itself, then back out of a return jet. The filter case houses the cartridge and is accessed by removing the top of the filter.
  
  

Maintenance

• A cartridge filter is known for its easy maintenance practices. Under normal conditions the cartridge should only require cleaning about once per month. The cartridge itself should be replaced every four to five years or as necessary. When the pressure increases as indicated on the gauge the filter must be turned off. Every filter has a pressure release valve that must be opened prior to cleaning. The top of the filter is then removed, usually by a turn and lock mechanism, to access the cartridge. To clean the cartridges simply hose off the dirt and place the cartridge back into the filter housing. The filter is then reassembled and ready for operation again.