Years ago, I had trouble with my septic system. If you’ve ever had that kind of trouble, you know what kind of trouble it can be. I was living in my old farmhouse out in the middle of the woods and had no idea where the sewage went until it suddenly went nowhere. That’s when I called the septic guy. The house (and presumably the septic tank) was 100 years old, and I had never had occasion to get overly curious about where the septic tank was or exactly how it worked— until it didn’t. The septic guy located the tank and ...