Peracetic acid, high-level disinfectant and/or cold chemical sterilising is in itselfs thermodynamically unstable. To have a stability of at least 12-18 months it has to be marketed in its concentrated form (5, 15 or 35% p/p). Concentrated peracetic acid solutions are oxidising, inflammable and corrosive. Therefore their land transport, air transport and maritime transport require particularly burdensome restrictions without forgetting that a storage at more than 30 degrees helps its rapid degradation. Also, their manipulation requires the adoption of particular environments and PPE. The patented innovation put forward by GIOCHEMICA makes it possible to have a system of two liquid components perfectly stable (36 months), not dangerous and therefore easy to transport and manipulate; once mixed together at the time of use they provide a concentrated or ready to use peracetic acid solution. Based on this patent every system using concentrated peracetic acid to be diluted, including current endoscope washers, can be converted in order to take advantage of a high level liquid disinfectants or cold chemical sterilising prepared in-situ in a closed circuit, therefore not dangerous or instable. Our scientific "staff" is at your disposal for further information.