Anyone used the Aquasure Harmony water softener? What extra maintenance is required after install?

Hi, I was thinking of buying a Aquasure Harmony water softener from a friend of mine for my home in Phoenix. I don't mind the water at all but I guess it is bad for the new build house.
I was wondering that if I install his Aquasure Harmony water softener into my home, what is typically the usual maintenance that is required and costs?
It's just me living here in a 3 bdr 2 ba house.
It sounds like it is maybe a new filter every 6 months .. the resin tank lasts 8-10 years .. new salt fill every few months?
Looks like there is also a Fortitude V2 Carbon and Sediment Whole House Water Filtration System which maybe needs filters to be changed out as well?

I'm new to this area and wasn't sure I needed this. Came from Southern California where it sounds like have the same hard water but never had/nor heard of needing a hard water softener but maybe the water in Phoenix is harder than in Southern California?

Just wondering what I'll be expecting if/when I do install this water softener. I just bought a new build home that I'm hesitant to do any modifications to this soon.