There are 3 main reasons I ask .
1, I clean carpets and upholstery , my tds (Bournemouth) is 380, I feel it could be shortening my equipment life.
2, My cars are really hard to get clean
3, my windows are hard to get clean.
I work a lot in Portsmouth and Southampton and wondered if the water was any softer there if so I would collect it to use at home .