Dishwashers typically have built-in sensors or indicators to determine when rinse aid or salt needs to be added. Here's how they work:
Rinse Aid: Many dishwashers have a rinse aid dispenser located inside the door or near the detergent dispenser. The dishwasher uses a sensor to detect the level of rinse aid in the dispenser. When the level gets low, the sensor triggers an indicator light on the control panel or a specific message on the display, notifying you to refill the rinse aid.
Salt: Dishwashers that have a built-in water softening system require the use of salt to regenerate the water softener resin. These dishwashers often have a salt reservoir located at the bottom of the dishwasher or in the side panel. A salt sensor measures the level of salt in the reservoir. When the salt level becomes insufficient, the dishwasher will display a warning light or a message indicating that it's time to add more salt.
It's important to note that not all dishwashers have built-in sensors for rinse aid or salt. Some models may rely on a predetermined time interval to remind you to add these substances, regardless of the actual usage. It's best to consult your dishwasher's user manual for specific instructions regarding the monitoring and refilling of rinse aid and salt for your particular model.