Look into retro fitting recirculation pumps. You don’t necessarily need access to the plumbing behind a wall and can add a loop under a sink in your bathroom. Ask This Old House has quite a few videos on the subject: https://youtu.be/KdA_gfau1s4

There’s citric acid based softeners as well like nuvoh2o https://nuvoh2o.com/

Not sure how it affects septic systems though.

I have a cat. He is a pet. Not a fur baby or child. I am not a cat. He’s too old to be a baby. Young cats are kittens, not babies. I also very dislike doggos and kiddos.

Not sure why I wrote all that like a four year old. Maybe because that’s how I view the intelligence level of those that feel the need to use that kind of language.