Smeg Dishwasher DI612CAH Instruction Manual page 21

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.
3.2 Using the rinse aid and detergent dispensers
The detergent
dispensers are situated on the inner
part of the door: the detergent
dispenser is on the left, and the
rinse aid dispenser is on the right.
With the exception of the SOAK program, before every washing cycle it
is necessary to add the required amount of detergent to the detergent
dispenser. The rinse aid, on the other hand, should only be added as
required.
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User instructions
and rinse aid