Smeg DWD409WH - Manual (Page 14)

User instructions
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• Do not use table salt as it contains insoluble substances which,
over time, may damage the water softening system.
• When necessary, refill the regenerating salt container before
starting the washing program. In this way, the excess saline
solution will be immediately removed by the water; the prolonged
presence of salt water inside the tank may lead to corrosion.
Be careful not to confuse the salt and detergent packages; adding
detergent to the salt container will damage the water softening system.
ADJUSTING THE WATER SOFTENING SYSTEM
The dishwasher is equipped with an device for the user to adjust the
water softening system according to the hardness of the water supply.
According to the machine model, the selector which acts on the
adjustment may be located:
• inside the plastic locking ring located on the right-hand side, inside
the dishwasher;
• inside the water softener, just below the cap.
Both allow for adjustment to 5 settings: