Filters are well, filters. What gives our water hardness and a certain taste is calcium. The calcium is an ion attached to H2O. Filters can not filter out ions.
To remove the ions you need an ion exchange system, aka a water softener. It doesn't matter which brand that you choose. As ALL ion exchangers use the same process. There is no changing the physics/chemistry of removing the calcium ions.
Now filters do catch some particulates and you may notice that in the taste. Mainly, though, you'll feel good about having a filter. Psychologically that can make a huge difference to many people. But you don't get a new version of chemistry just because you have a filter, you need an ion exchanger. Sorry to sprinkle some reality to the owners of filtration systems
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