Abstract: A removable treatment vat is connectable via a quick-release coupler to a fixed installation including a control unit together with a fluid monitor and a fluid driver for driving treatment fluid(s), said fluid driver being suitable for causing the fluid(s) to circulate under given conditions of flow rate, pressure, and temperature, from a fluid inlet to the coupler to the vat. The fluid driver includes a fluid circuit and a circulation pump; the control unit includes an electronic control circuit suitable for running the treatment process as a function of data coming from the above-mentioned fluid monitor and data specific to the vat, and possibly also data specific to the treatment proper.