If water filtration is added, no need to filter the water that goes to any outside fawcetts! Have plumber research & quote that separation of cold water.
Unfortunately, there is no one answer to all these issues. Hard water will definitely leave sediment and issues in mixing valves, etc.
Obtain multiple opinions and your own research.
If you ever think about having a hot tub spa, here's an idea to save the electricity to heat the water when it's filled or changed: have plumber install a hot water fawcett next to the cold. I added an inexpensive Y shaped hose thing to mix the hot & cold outside, then a short garden hose to fill hot tub. Thus, saving a lot of electricity and time to heat the water. In my town, the municipal water in winter is as cold as 34 degrees because the pipes are under the street and not insulated by snow! Hard to believe, but yes that cold.
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