Swimming pool water needs regular filtering of heavy sediments as well as light suspendable particles and objects. This process has to do before cleaning or sanitizing of water begins, as these heavy big particles cannot be eliminated by chlorination, UV rays or any other sterilization methods.
This process requires the swimming pool pump, large sand filters, etc. This filtration process is not only needed to clean the water but also to avert sedimentation at the bottom of the pool and clogging the pool pump and drainage mechanism.
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The pool pump does the job of filtering light yet bigger suspendable particles like leaves, lint, hair, dirt, etc. which got collected in the strainer basket or lint pot inside the pool pump. The pump also pushes the water in sand filters which are large tanks made of fiberglass, concrete or metal.
The sand filter over time gets saturated with deposits of the sediments, which in turn slows down the water flow inside it and thus create pressure. When the gauge displays the pressure reading beyond normal, then it's time to backwash or repairs the filter.
A diatomaceous earth filter or a cartridge filter can also be used as pool filters. In diatomaceous earth, filter water is passed through grids of fossilized earth like sea organism called diatoms. This process is very effective as it filters particles as small as 1 micrometer in size.