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Manufacturers of 3 in 1 tablets write that salt can NOT be used when water hardness is UP TO 21 dH; PMM manufacturers recommend using salt when water hardness is FROM 16 dH. The rinse aid is at your discretion, in 3 in 1 tablets there is little of it and it is dry, especially after the main wash and 1-2 intermediate rinses there will be little left of it, it is better to use a regular rinse aid, it will work in the required dosage at the final rinsing stage.
Manufacturers of 3 in 1 tablets write that salt can NOT be used when water hardness is UP TO 21 dH; PMM manufacturers recommend using salt when water hardness is FROM 16 dH. The rinse aid is at your discretion, in 3 in 1 tablets there is little of it and it is dry, especially after the main wash and 1-2 intermediate rinses there will be little left of it, it is better to use a regular rinse aid, it will work in the required dosage at the final rinsing stage.