Amir, i apologize for my comment about your friend.
I thought he meant salt salt, not water treatment salts.
He’s suggesting a pricy alternative to vinegar. (con)
Most dishwashers operate at a significantly higher temperature than Anova cooks at thus they have increased accumulation of visible salts, often called limestone, so treated water could be your solution.
In my experience the best dishwashing compounds contain those specialized salts in varying amounts according to region, but they are not applicable for your Anova.
It you live in a very hard water area that salt accumulation is going to be throughout your home wherever you use water. You might be better off using a whole house treatment system rather than something just for your Anova. Besides you will use a lot less detergent for laundry and ware washing use plus your skin and hair will feel a lot better after bathing.
My preferred approach to getting clean service ware from a mechanical dishwasher is to inject a wetting agent in the final rinse water which prevents the salts suspended in the water from adhering to surfaces. In most very hard water areas, like across the North American prairies, one still has to de-lime on a regular schedule.
I would like to test the Bosch product for cost effectiveness, thanks for the lead.