Abstract: A water-guiding household appliance, in particular, a washing machine, connected to a first water supply line for cold water and to a second water supply line for hot water has the water supply lines connected to a mixer tap enabling water to flow into a suds container through a supply line. The mixer tap is integrated into a regulating device used to regulate the temperature of the water flowing into the suds container.

Abstract: Impermissibly high scaling is ascertained of an optical measurement section in which the turbidity of a washing liquid is detected in a domestic appliance that is operated with hard water, such as a washing machine or dishwasher. The appliance has an evaluation circuit for the measured signals from the measurement section and a microprocessor for binding the measurement results into the sequence control system of the appliance. The system is suitable for indicating impermissibly high scaling and for taking into account attenuation of the measurement section by chalk deposits during the determination of the turbidity of the washing liquid.