Hello,
Still, whether for food or for greenery - we all have that choice, right - there is no need to send nutrients off to a treatment plant or to pump them in a clandestine way over the fence when they can be retained close to home. And all the more reason to be conscious of what goes down the drains, though a good functioning septic tank is robust enough for almost anything typically used at home.
Greetings,
Don Wagstaff