A Swimming Pool Filter helps to remove contaminants so that youre never diving into murky water. They can trap contaminants between 20 and 100 microns in diameter. They can be used in both freshwater and saltwater aboveground pools. It consists of a suction pump that purifies the water and puts it back into circulation. Inside the filter pump, there are sand or cartridge filter system units that have different characteristics depending on the type of pool and its size. Swimming Pool Filter is very effective.