We have a softener and a “commercial” reverse osmosis unit with a built-in diaphragm pump and a 14 gallon pressure tank. We have been doing yearly changes on the filters. Household of 3 though.
The softener is a puronics brand, the RO unit is Ecosoft RObust 1500.
Not needing to tackle hard water stains and build up every 2 weeks made it worth it, but it was a significant investment (plus we ran RO lines from the garage/tank to the kitchen).
And with the pump set to 60psi, I can have infinite carbonated water without another expensive setup.






















I riffed on this kind of concept for a cocktail I just call “brunch.”