Check out Burkey water filters - top notch - last 5 years - leaves in the healthy minerals (vs reverse osmosis that removes the good stuff). Popular with prepers too.  
nostr:nevent1qqspv89yr9hjvac6k7dwvcsky50h9gxqmazqy76mhhwpqljeu04dy6qpz3mhxue69uhhyetvv9ujuerpd46hxtnfdupzq50uwgyjqxc5znmjrs7j62e5xp5ek8nrzackc5vzeswhj3g89c6cqvzqqqqqqyqyt93q 

 My RO filter has an insert that adds them back in. Inefficient, but it filters much better than these. (I've tried both) 

 However, I live in a place that has super hard water and the Berkey didn't like that at all. In fairness, I believe the product info warned of that. So it may actually work well for some people. 

 love my berkey