WATER SOFTENING METHOD WITH DETERMINATION OF REGENERANT CONCENTRATION VIA PUMP DURATION AND PUMP VOLUME OR A MASS TO BE TRANSPORTED

The invention relates to a water softening device comprising: a softening unit, in particular comprising at least one container with ion exchange resin; a storage vessel used for storing a regenerantsolution and further comprising a solid regenerant salt; an ejector used for transporting the regenerant solution from the storage vessel to the softening unit; an electronic control device for controlling the delivery of the regenerant solution from the storage vessel into the softening unit. The water softening device is designed to: predetermine or measure the volume V1 or the mass M1 of the delivered regenerant solution in a delivery step; predetermine or measure a duration t1 for conveying the volume V1 or the mass M1; and the electronic control device is used for determining the concentration CRM1 of the delivered regenerant solution and/or a parameter dependent on the concentration of the delivered regenerant solution from V1 or M1 and/or t1 by means of a stored calibration function. The invention also relates to a method for operating the water softening device.