An operating method of a linen washing machine comprising the step of: i) loading a washing liquid into a washing compartment, said washing compartment containing a drum that can rotate and that houses the linen to be washed, said step of loading the washing liquid comprising: - a step of introducing the washing liquid until a first pre-defined level is reached, said first level surmounting a lower portion of the drum; - introducing into the compartment a top-up liquid following a pre-determined absorption by the linen of the washing liquid already contained in the compartment; the top-up liquid once introduced into the compartment also being considered washing liquid; the method being characterised by further comprising the steps of: ii) determining a first parameter univocally associated with the quantity of top-up liquid introduced into the compartment; iii) determining a set of parameters associated with a quantity of water to be used in a rinse step of the linen, wherein the step of determining said set of parameters envisages a comparison of said first parameter with corresponding predetermined intervals of such first parameter, wherein each of said intervals is associated with a corresponding set of parameters associated with the quantity of water to be used in a rinse step; iv) performing a rinse step by adopting the set of parameters corresponding to the interval identified by said comparison step of said first parameter with corresponding pre-determined intervals of such first parameter. i) loading a washing liquid into a washing compartment, said washing compartment containing a drum that can rotate and that houses the linen to be washed, said step of loading the washing liquid comprising: - a step of introducing the washing liquid until a first pre-defined level is reached, said first level surmounting a lower portion of the drum; - introducing into the compartment a top-up liquid following a pre-determined absorption by the linen of the washing liquid already contained in the compartment; the top-up liquid once introduced into the compartment also being considered washing liquid; - a step of introducing the washing liquid until a first pre-defined level is reached, said first level surmounting a lower portion of the drum; - introducing into the compartment a top-up liquid following a pre-determined absorption by the linen of the washing liquid already contained in the compartment; the top-up liquid once introduced into the compartment also being considered washing liquid; ii) determining a first parameter univocally associated with the quantity of top-up liquid introduced into the compartment; iii) determining a set of parameters associated with a quantity of water to be used in a rinse step of the linen, wherein the step of determining said set of parameters envisages a comparison of said first parameter with corresponding predetermined intervals of such first parameter, wherein each of said intervals is associated with a corresponding set of parameters associated with the quantity of water to be used in a rinse step; iv) performing a rinse step by adopting the set of parameters corresponding to the interval identified by said comparison step of said first parameter with corresponding pre-determined intervals of such first parameter.