Swimming pool water must be treated to maintain it clean, clear and free from harmful bacteria and pathogens. Water recirculation and purification is needed to make the water suitable, safe and in pleasant condition for swimming.

Purification of the water will be done through filtration and disinfection before circulating it back to the pool. Many types of filtration technologies can be used like Ultra filtration, Multimedia filtration and Reverse Osmosis to remove the suspended solids and particulate matters in order to maintain the clarity of the water. Disinfection of the pool water is required for the destruction of algae, bacteria and virus that will be harmful for humans.