>>As we live in a soft water area, for last 12 years we have simply used a tablet.
I'm never quite sure about this either. The rental house had a water softener, an ancient under sink thing with low maximum flow that didn't matter much because the 'ot water came from a dead pigeon tank. But the effect on the local, moderately hard, water was magical. Soap actually worked. Hence we put a high flow softener (which just seems to mean 22mm pipes instead of 15mm) in the new house (no dead pigeon tank, all water at mains pressure).
I don't see why the dishwasher needs salt too but I still put some in.
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