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This is a geographical difference. North American market dishwashers don't typically have that; people use whole-dwelling water softeners that feed all washers (including human).

Oh huh, that's pretty wild. Learned something new today!

I don't think I've seen salt compartments in dishwashers in North America.

I have one in mine. though it's a bosch which is german owned.

Only Bosch and Miele have them, that I've seen.

Water softeners aren't actually standard issue in all dishwashers, but if you're replacing your dishwasher it isn't hard to find one with that feature.

I've just been told that it's not standard in North America, but it's definitely a standard feature where I'm at. I've got the cheapest IKEA dishwasher and it has that feature.

Interesting cultural differences cropping up in unexpected places I suppose.