Patent ID: 8668830

Claim:
A method for operating a water softening blending system comprising: mixing a blended water flow V(t) blended from a first, softened partial flow V(t) part1soft and a second untreated water partial flow V(t) part2raw with an automatically adjustable blender; and readjusting an adjustment position of the blender with an electronic controller using one or more experimentally determined instantaneous measured values in such a fashion that a water hardness in the blended water flow V(t) blended is adjusted to a predetermined desired value (SW), and wherein the electronic controller ignores at least one of the one or more instantaneous measured values for readjustment of the adjustment position of the blender in one or more defined operating situations of the water softening blending system, and instead uses a respectively last corresponding measured value that was valid prior to occurrence of the defined operating situation, or a standard value for a corresponding measured value, which is stored in the electronic controller, wherein the method comprises a sensor in an untreated water area of the water softening blending system for determining an instantaneous untreated water hardness WH raw inst and at least two flow meters for direct or indirect determination of instantaneous partial flows V(t) part1soft inst and V(t) part2raw inst and the electronic controller ignores at least one of the instantaneous measured values WH raw inst ,V(t) part1soft inst and V(t) part2raw inst for readjustment of the adjustment position of the blending device in the defined operating situations, and instead uses a respectively last corresponding measured value that was valid prior to occurrence of the defined operating situation or a standard value for a corresponding measured value, which is stored in the electronic controller.