Email jdw159828@gmail.com.
Please include your device model and iOS version. Replies usually come within two business days.
Common questions
Does one subscription cover all ten banks?
Yes. A single subscription unlocks every bank in the app, including Operator Math. There is
no per-bank purchase. The free allowance is shared too: 25 questions on your first day,
then ten a day, counted across all ten banks rather than per bank.
Which banks are included?
Operator Math, Treatment Processes, Collection Systems, Collection Maintenance, Plant
Operations, Backflow Prevention, Advanced Treatment, Distribution, Wastewater Treatment and
Drinking Water Basics. Each bank keeps its own progress, so working one does not disturb
the others.
What is in the Operator Math bank?
296 calculations, each worked out in full: chemical dosage and the pounds formula,
hypochlorite strength, chlorine demand, detention time, surface and weir overflow rates,
filtration and backwash rates, pipe velocity, per cent removal, water and brake horsepower,
CT values, solids loading, specific capacity, flow conversions and tank volumes. Every one
shows the formula, the numbers put into it, the arithmetic, and the mistake that question is
built to catch.
Does it cover my state's exam?
The content follows the topics that standardised water and wastewater operator examinations
cover, and most of that is the same everywhere — chlorine chemistry, hydraulics, process control
and the federal drinking water rules do not change at a state line. What each state sets for
itself is eligibility, experience credit, fees and grade levels, and those are not in the app.
Confirm those with your own certifying authority.
What does a subscription open?
It removes the daily limit of ten questions and opens mock exams (timed and scored against
the pass mark) and read-through (answers and explanations laid open, page by page, unscored).
Practice in order, random draw and redo missed all work on the free tier, within the daily ten.
Where is my progress stored?
On your device only. There is no account and nothing is uploaded. Deleting the app deletes
all of it.
I paid but the app still shows the free limit.
Open Subscribe and tap Restore purchases. Make sure you are signed in with the same
Apple Account used for the purchase.
How do I cancel a subscription?
Subscriptions are managed by Apple, not by this app. Open Settings in the app and tap
Subscription, then Cancel subscription — that opens Apple's own subscription panel. You can also
get there from the Settings app: tap your name, then Subscriptions. Cancelling takes effect at
the end of the current period and you keep access until then.
Does it work without a network?
Yes. The questions, explanations and fonts are all inside the app. Nothing is fetched while
you study.
I think an answer is wrong.
Please email the bank name, the question number and what you believe the correct answer is.
Corrections are taken seriously and shipped in the next update.
About the content
This is an independent study aid. It is not affiliated with, endorsed by, or sponsored by any
certifying body, state agency, testing organization, or training provider. Question content is for
exam practice only. Certification requirements, exam content and pass marks are set by the states
and by the certifying bodies and can change — always confirm the current rules with them
directly.