"Chlorine Disinfection: Dose and Safety (CPC 609.10)" is lesson 5 of 5 in the Water Conditioning (C-55) Learning Hub. It opens with "When Disinfection Applies" and works through 6 short steps, then a worked example you can check yourself against.
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The worked example in the course applies this lesson to a realistic job in 6 steps, from "Flush first" through "Check worker exposure while pouring and flushing".
CPC Section 609.10 says new or repaired potable water systems shall be disinfected prior to use where required by the Authority Having Jurisdiction, and the method followed is the one prescribed by the Health Authority or, if none is prescribed, the sequence printed in 609.10. The CSLB C-55 study guide lists disinfection under troubleshooting, maintenance, repair and replacement, so expect to disinfect piping and equipment you install or open up.
CPC 609.10 prints four steps. First, flush the system with clean, potable water until potable water appears at the outlets. Second, fill the system or part of it with a water-chlorine solution of not less than 50 parts per million, valve it off and let it stand 24 hours, or fill it with not less than 200 parts per million and let it stand 3 hours. Third, flush with clean potable water until the chlorine residual in the water coming from the system does not exceed the residual in the flushing water. Fourth, repeat the procedure where a bacteriological examination by an approved agency shows that contamination persists.
The remaining 4 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.
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