"a flow regulator that per my inspector "changes direction each time you flush"
I'm sorry to be laughing out loud, but I've never heard of something so ridiculous. I think your source is full of BS! Send me a link on how this "Flow Regulator" works. Demand tat your inspector supply you with links & details about his "Flow Regulator"
All septic systems work pretty much the same way. A septic tank collects all the water from the house, which is sent to the septic field through a pipe & distribution box(es). More complex systems may have pumps involved to pump the septic flow into a mound system.