Water Supply
Chlorine Dose
Mass of chlorine — and equivalent bleaching powder — required per day for disinfection.
Formula
Mass = Q · Dose, Bleaching powder = Mass / (% available Cl)
Typical residual at consumer end: 0.2–0.5 mg/L; applied dose: 1–3 mg/L plus chlorine demand.
Fresh bleaching powder (CaOCl₂) ≈ 30–35%; high-test calcium hypochlorite (HTH) ≈ 65–70%.
Resultlive
- Pure chlorine required
- 3kg/day
- Bleaching powder required
- 10kg/day
- Stock solution (5%) volume
- 200L/day
- Per month (≈ 30 days)
- 300kg
Stock solution (5%) volume: If feeding chlorine as a 5%-by-mass stock solution.
Per month (≈ 30 days): Bleaching powder consumption.
Reference: Mass balance for chlorination. Stock-solution volume assumes 5% w/w (50 g/L) preparation.