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Practice ozone generation, oxidation, bromate management, off-gas controls and advanced oxidation. Includes process-credit limits, emergency response and downstream biological stability. Cover: [BrandonXLF](https://commons.wikimedia.org/wiki/File:F._J._Horgan_ozone_generator.jpg), [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/); resized, no other edits.
Nov 3, 2026
Practice UV fundamentals, transmittance, ideal fluence and validated-reactor operation. Includes fouling diagnosis, maintenance precautions and distribution residual limitations. Cover: [Z22](https://commons.wikimedia.org/wiki/File:Cutaway_model_of_UV_disinfection_unit_used_in_NEWater_water_treatment_plants.jpg), [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/); resized, no other edits.
Nov 3, 2026
Practice ammonia-N dosing, chloramine formation controls and nitrification diagnosis. Includes monitoring, storage turnover and coordinated temporary free chlorine conversion scenarios. Cover: [U.S. Department of Agriculture](https://commons.wikimedia.org/wiki/File:Water_storage_tank.jpg), [CC BY 2.0](https://creativecommons.org/licenses/by/2.0/); resized, no other edits.
Nov 3, 2026
Practice interpreting TTHM/HAA5 results, precursor chemistry and operating tradeoffs. Includes a site-average exercise and distribution scenarios; preserve required microbial protection when optimizing DBPs. Cover: [Carla Rubi Valda Trujillo](https://www.pexels.com/photo/pouring-water-to-vial-in-laboratory-16960261/), [Pexels License](https://www.pexels.com/license/); resized, no other edits.
Nov 3, 2026
Master disinfection efficacy & the epa ct concept through 15 rigorous, scenario-based practice questions. Explanations provide step-by-step mathematical derivations with explicit dimensional cancellation, regulatory context under US EPA SDWA guidelines, and content-based distractor rationales.
Nov 3, 2026
Master the breakpoint chlorination curve through 15 rigorous, scenario-based practice questions. Explanations provide step-by-step mathematical derivations with explicit dimensional cancellation, regulatory context under US EPA SDWA guidelines, and content-based distractor rationales.
Nov 3, 2026
Master disinfection chemicals: gas, hypochlorite & on-site generation through 15 rigorous, scenario-based practice questions. Explanations provide step-by-step mathematical derivations with explicit dimensional cancellation, regulatory context under US EPA SDWA guidelines, and content-based distractor rationales.
Nov 3, 2026
Master chlorine chemistry in aqueous solutions through 15 rigorous, scenario-based practice questions. Explanations provide step-by-step mathematical derivations with explicit dimensional cancellation, regulatory context under US EPA SDWA guidelines, and content-based distractor rationales.
Nov 3, 2026
Practice fifteen original safety decisions for drinking water treatment operators. Evaluate energy isolation, stored energy, corrosive handling, PPE and emergency flushing. Prerequisite: equipment and chemical hazard awareness. Outcome: explain a safe servicing and chemical-work decision. This practice supports study; facility procedures and hands-on qualification remain necessary. Cover: [Kindel Media on Pexels](https://www.pexels.com/photo/close-up-photo-of-person-holding-safety-glasses-8487779/). Eye-protection and gloves illustration for personal safety, not certification of chemical compatibility.
Nov 3, 2026
Practice fifteen original safety decisions for drinking water treatment operators. Classify confined-space hazards, interpret atmosphere tests, and distinguish entry-team responsibilities. Prerequisite: workplace hazard recognition. Outcome: identify missing entry safeguards. This practice supports study; facility procedures and hands-on qualification remain necessary. Cover: [David McElwee on Pexels](https://www.pexels.com/photo/manhole-in-sidewalk-12193138/). Utility access-cover illustration for confined-space hazard recognition, not proof of permit classification of the photographed space.
Nov 3, 2026
Practice fifteen original safety decisions for drinking water treatment operators. Recognize chlorine-release hazards and distinguish routine operator actions from trained emergency response. Prerequisite: chlorine container awareness. Outcome: evaluate response resources and exposure controls. This practice supports study; facility procedures and hands-on qualification remain necessary. Cover: [Alexander Wittke on Pexels](https://www.pexels.com/photo/firefighters-in-hazmat-suits-securing-a-damaged-container-on-the-roadside-19375362/). Hazmat emergency response illustration, not a demonstration of a specific chlorine repair or authorization.
Nov 3, 2026
Practice fifteen original safety decisions for drinking water treatment operators. Interpret chlorine hazards and assess cylinder storage, movement and gas withdrawal. Prerequisite: basic plant orientation. Outcome: explain when a handling plan needs correction. This practice supports study; facility procedures and hands-on qualification remain necessary. Cover: [Jonathan Cooper on Pexels](https://www.pexels.com/photo/industrial-gas-cylinders-on-construction-site-33852427/). Industrial cylinder handling illustration. These cylinders are not identified as chlorine containers; photo is not a chlorine equipment specification.
Nov 3, 2026
