There are two main types of filters, sand filters and cartridge filters. When it comes to choosing a pool filter, bigger is not always better. It’s wise to remember that a pool filter must always be matched to the correct size pool pump, and never the other way around.
Sand filters are the easiest type of filter to operate and maintain. The filter system works using a special type of sand that traps particles in the 20 to 100 micron range. A sand filters’ efficiency increases as it collects dirt, allowing it to trap debris more efficiently as time goes by. It is, however, necessary to replace a sand filter’s sand approximately every two to three years.
Cartridge filters are able to trap particles in the 25 to 100 micron range. To clean a cartridge filter the cartridge is removed and hosed down, from top to bottom, with a high power hose. Care should be taken when cleaning a cartridge filter, as too much pressure can damage the filter. A cartridge filter should be replaced every year seeing as, with each cleaning, its filtering capacity is reduced.