How your Pool System works
Below is a basic layout of a Swimming Pool Filtration System, showing just how the water in your Pool is circulated.
The water is sucked through the Skimmer into the Pump then to the Filter, where any dirt and loose particles are separated from the circulating water and trapped. The filtered water then passes through into your Heater where it is heated. The filtered and heated water then passes through any additional equipment that you may have (e.g. Chlorinator/Brominator, Salt Chlorinator or Auto Dosing System). The water is then fed back into your Swimming Pool (return) and the cycle continues…
You may have an additional wall fitting inside your Swimming Pool (usually below the Skimmer) which is a Vacuum Point.