An annual pumping requirement is probably tied to kick-backs, but there's no way to avoid that expense. However, I've been told that you cannot discharge water conditioning brine into the septic, nor can you discharge it to the sump / foundation drains / daylight, and was given a list of subscription brine haulers.......county's argument was that the salt can harm the septic tank.
I've spoken with several builders and water conditioning folks, and the common reply is to wait until the system is inspected, THEN install the conditioning and drain into the septic. My dad has been doing this for 25+ years in rural New York and has never had a problem. Any research, data, or personal experiences as to why I shouldn't go that way?