• Sand and cartridge pool filters each have advantages and disadvantages.pool image by goce risteski from Fotolia.com
  
  

Sand Filters

• The sand used in sand filters is a special silica blend that traps particles as small as 20 to 40 microns. Sand filters must be backwashed approximately every four weeks. Backwashing uses water, which adds to the cost in maintenance. The sand should be replaced every six to eight years and is inexpensive.
  
  

Cartridge Filters

• Cartridge filters are commonly made from corrugated pressed polyester fibers and filter out contaminates as small as 10 to 20 microns. The cartridge must be removed from the filter and cleaned with a garden hose once or twice each year. A cartridge filter lasts for one to two years and is more costly than sand. The cost depends on the type and size of the filter.
  
  

Bottom Line

• Cartridge filters are the better pool filter due to their ability to trap smaller contaminates. They are also less work-intensive but the replacement filters are more expensive.