The water of the pool flows into a perimeter channel and from this it goes into a tank, called “overflow tank”. From here it is then sucked by the filtration installation and then it’s sent to the pool. The cleaning of the surface turns out to be definitely superior to the skimmer system, the stratum of water on the surface, which is always the most “polluted”, is quickly and constantly purified. Moreover, the “mirror” effect, that it creates, is of a great visual impact and the pool seems to be wider. The infinity pool is a more complex system than the skimmer one and it is more expensive. Pools with overflow edge have got a possible variant with “cascade” used in a context with a sloping terrain or on terraces, with a side that seems to let water slide in the horizon.