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WPI — BC / AB / SK / MB
Class I Water Treatment
Formula Sheet
CT values, chlorine dosage, flow rate, turbidity, chemical dosing, sedimentation, and pumping — aligned with WPI Need-to-Know Criteria.
🦠 CT Values & Disinfection
6 formulas📋 WPI Class I Quick Reference
Turbidity target
≤ 0.3 NTU (95% of samples)
Free Cl₂ residual
0.2–4.0 mg/L at entry
Giardia inactivation
3-log (99.9%)
Virus inactivation
4-log (99.99%)
Fluoride target
0.7 mg/L (Health Canada)
pH range (drinking water)
7.0–8.5
Alum optimal pH
6.5–7.5
Rapid mix G value
300–1,000 s⁻¹
Flocculation G value
10–100 s⁻¹
Typical SOR
20–40 m/d
Rapid sand filter rate
5–15 m/h
Backwash rate
30–60 m/h