The Wisconsin plumbing code SPS383.54(3)(b) requires that “the servicing frequency of an anaerobic treatment tank for a POWTS shall occur at least when the combined sludge and scum volume equals one-third of the tank volume.”
Several years ago, a burgeoning cottage industry of "maintainers" sprang up, explaining to those receiving their three-year county reminders for pumping that less-expensive measuring of your solids might be the best course of action — why pump if you are at less than one-third solids?Online (where anything goes) I see people saying, “I haven’t pumped my system in 20 years, and it’s just fine.” I want
