Pigs do a good job of cleaning up anything you cannot sell. Thats how it is in permaculture. You have needs and outputs. Your design is such that outputs or products flow naturally to needs. Without good design needs would be inputs that you paid for. If outputs don't flow naturally you have WORK. And your design is poor. Poor design leads to work. But what happens if you have products, or outputs, that don't get used? Well this becomes POLLUTION. What do you do with this sort of pollution? You can bury it in a hugelculture bed. But the easiest thing to do is to feed it to the pigs. Pigs clean up everything that you cannot sell.