System for dispensing a detergent solution from a solid detergent into a dishwasher comprising a dispenser

A system for dispensing a detergent solution from a solid detergent into a dishwasher, the dishwasher including a washing chamber and being capable of performing cleaning cycles each including washing and rinsing periods, the system comprising:

• a dispenser for dissolving solid detergent blocks and dispensing detergent solution, the dispenser configured to:
• accommodate solid detergent blocks in an amount sufficient to provide detergent solution for at least 10 cleaning cycles;
• be removably retrofittable into the dishwasher by being mounted on an interior wall within the washing chamber of the dishwasher;
• collect water or liquid sprayed within the washing chamber;
• guide the collected water or liquid to the solid detergent blocks accommodated in the dispenser, whereby a portion of the solid detergent blocks is dissolved and a detergent solution is formed;
• and
• allow continuous release of all detergent solution as it is formed;
• and
• a battery-powered device configured to operate independently of the dishwasher and to be removably retrofittable into the dishwasher, the battery-powered device including a control unit and a conductivity sensor, the conductivity sensor configured to measure the conductivity of the washing liquid and to provide the measured conductivity value to the control unit when the battery-powered device is removably mounted in the dishwasher, the control unit configured to process the conductivity value and to produce a signal to be displayed independently of the dishwasher to indicate that the dispenser is to be refilled with solid detergent blocks if the conductivity value is below a preset threshold value.