Abstract: The present invention relates to an installation for automatically purifying one or more enclosures located in one or more premises, such as toilets, comprising:a supply module comprising a control panel and a reservoir of liquid purifying product;at least one module for spraying the purifying product, comprising an electrovalve and a spray;each spray module being connected to the supply module via a single pipe;characterized in that it comprises means for placing said product under pressure, solely in said pipe, the pressure being substantially greater than atmospheric pressure.