The filter is one of the most important pieces of swimming pool equipment. It traps within it particles dirt and debris and returns clean water back to your swimming pool. Inground swimming pools pools and large above ground swimming pools usually have sand filters. These consist of a large cylindrical chamber filled with special filter sand. Pool water is pumped in under pressure at the top and works its way down the filter and leaves at the bottom. On the way and dirt in the water should be trapped inbetween the particles of sand. Smaller pools usually have a paper cartridge filter. The water is pumped through the filter cartridge and the dirt is trapped by the paper.
Filters need to cleaned regularly. In the case of sand filters the water must be re-directed up through the sand bed and out to waste. On the way up it flushes out the dirt. This is called back washing. Sand filters come with a valve to change the direction of water flow it is known as the multiport valve. It can be mounted on the side of the filter or on the top. If it is side mounted there is usually a glass dome in top of the filter to view the water. Paper cartridge filters are cleaned by removing them and hoseing them off but they dont last very long so it is important to replace them with new ones regularly.
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