Eventually, the sludge layer at the bottom grows too thick. Unlike your compost bin, this isn’t a “set it and forget it” situation. Every one to three years, you need a professional desludging service to pump out the solids. Yes, it costs money. No, you can’t skip it.
Think of it as a spa day for your plant. If you neglect it, the sludge hardens, the bacteria die, and your backyard becomes a mini ecological disaster zone. Pro tip: Keep a log of your pumping dates like you would a dentist appointment—because nobody likes emergency sludge.
Fun fact: The cleanest domestic treatment plants actually produce methane gas as a byproduct. Some high-end systems capture and burn it to generate heat. You’re basically running a tiny, weird methane-powered engine in your yard.
