Why does the filled salt dispenser of my AEG Favorit 40250i not empty ?

The dishwasher works satisfactorily other than the salt dispenser - I have changed the plastic filter as the mesh had split - this resulted in the washer arms being partially blocked with food debri which I have now carefully removed - I wonder if this has contributed to the salt dispenser problem? The other factor contributing to the problem might be I have used "Fairy All In One" tablets and for a time did not use any salt - but I have been advised that in our very hard water area one needs to use salt with the all in one washer tablets.

I would very much appreciate any advice on my problems!!!