Short video courses, each built around one thing that costs operators the exam. Taught by a
licensed operator and plant manager, and built from the real questions in the practice banks
here. Water Operator Math is out now, and the next three are in the works.
The same worked-by-hand approach for the wastewater exams: loading rates, sludge age, F/M, MLSS, and digester and lagoon math.
Coming soon
Drinking water
Water Treatment Processes
Coagulation through disinfection: how each step works, what goes wrong at the plant, and how the exam asks about it.
Coming soon
Wastewater
Biological Nutrient Removal
Nitrification, denitrification and biological phosphorus removal: what the bugs need, how SRT, DO and alkalinity steer them, and how to troubleshoot when effluent drifts.
Practice free, either way
The practice banks are free and always will be. 4,300+ questions, every certification level, all 50
states, with an explanation on every question.
