Within the offer of existing automatic pool cleaners (or pool robots) there are several different models depending on their operation. On the one hand there are the robots that work with hydraulic power and that are connected directly to the drains of the pool, from which they obtain the energy to clean and move.
In this case, the extracted water returns to the pool after the corresponding purification. Another model is the electric pool robots, which have an engine connected to the network and move through the entire pool with continuous tracks and wheels, serving to clean walls and floors in a simple way. This model returns the used water directly to the pool, so it is not necessary to fill the vessel or adjust the PH.
Within this last model there is a third option that are battery pool robots. Its operation is equal to one electric and are useful for when the light is far away or for portable pools, for example.