At first sight, a pool does not look that complicated. After all, it is a big hole in the ground full of water. However, there are various parts hidden under the surface that fit together to form its sophisticated inner workings, which enable us to have a great time splashing around in crystal clear water.

Pool water moves in a continuous cycle, whose centrepiece is the pump. Equipped with an electric motor, this device has an impeller that drives water through the skimmers and sumps (found at the top and bottom of a pool, respectively), takes it to the filter and then returns it clean through the return nozzles, a series of small valves placed around the pool.

To prevent a pump from becoming clogged up, the water goes through a basket-type plastic prefilter in order to retain leaves and other debris that is sufficiently big to block the mechanism before it reaches the pump. From the pump, the water reaches the filtration system, where any small particles of dirt are held back.

The filters are plastic or fibreglass tanks that contain a filter bed, made of sand or glass. Gravity pushes the water through the sand or glass, which trap any dirt. When the water passes through the filter medium, it is pumped to the outlet pipe, which returns it to the pool. Obviously, as time goes by the filter medium must be cleaned, as the dirt that has built up can slow down the flow of water.

To keep the water clean and free of microorganisms, a water disinfection and treatment system must be used. There are a number of options available in the market: chemical products, salt chlorination, UV treatment and neolysis. The most commonly used is chlorine, which can be added in tablet, liquid or powder form. Ideally, it should be added after the filtration process using a dispenser or peristaltic pump.

These are the basic components involved in how a pool works. However, there are other devices that although seemingly inconsequential are able to streamline a pool’s performance and turn it into an oasis of well-being:

Pool cleaning robots go over the pool floor and ensure a thorough clean of the shell, as well as consuming very little water.

Heating systems make it possible to keep that water at a certain temperature and should be fitted between the filtration system and dispenser.

Underwater LED spotlights keep power consumption down to a minimum, whilst the light that shines from the walls creates a relaxing atmosphere worthy of any great design.

Would you like more information? If you have any questions about how your pool works or its maintenance, do not hesitate to contact us.