I will say... Our softener dumps into our septic, which seemed to have caused real issues with our effluent filter clogging really routinely. After scheduling one regen per month, it's been a world of difference.
We used to also use septic treatments to introduce good bacteria... But that didn't seem to do much at all.
We use 60 gallons of water per day average in a 1500 gal tank. Our only real issue has been the effluent filter needing cleaned. The septic company said to clean it every 6 months, and if I do that, it will clog and the tank will back up. Therefore I have it on a 3 month schedule now.