Sediment or particulate filters are fine sieves which reduce dirt and other particles. Using one as a pre-filter will protect a water purifier from damage and extend its life, because it will take longer to become clogged with unwanted media.
Sediment filters range from coarse to fine, so they are rated accordingly.
Sediment filters can be made from wound string, rigid foam (Polyspun) or pleated film. They are usually mounted under the sink. The life of a sediment filter depends on the rubbish in the water – six to twelve months is average.