Generally speaking, hydraulicity is defined as the way water circulates in a basin. This circulation of water is ensured by a set of equipment (skimmer, filtration pump, solenoid valve, buffer tank, etc.) which varies according to the type of basin. Hydraulicity makes it possible in particular to avoid stagnation of water and to rid it of its impurities. There are several types of hydraulics depending on the nature and size of the basin (conventional, mirror, overflow, etc.): mixed, integrated and reverse hydraulics.