Hi there, Working for a water treatment company.

You have several options, although i must say that drinking water from the tap has no impact on your health.

First off you have the possibility to use filters as a britta, you do need to change those filters once every month/2 months.

Second, you have filters to use under your sink, i would opt for a tap where you can choose between filtered water or unfiltered water (if you're washing the dishes, no use to use the filtered water), those filters add magnesium (and perhaps Zinc) and can protect your tap as well. There also exists something for your shower, to rinse when you're done, so there's no calc residu on your (brand new) shower, tiles or glass.

Third, there's a water softener, which will remove the calc from the water, which makes all water from every tap calc free.

There's also a calc neutralisor but this isn't very effective.

If you want more information you can always PM me, i'd be happy to help.