Chlorine Dosage Calculator (lbs/day)

Chlorine feed in pounds per day equals dose (mg/L) × flow (MGD) × 8.34. Enter the dose and plant flow to calculate the mass of available chlorine required each day. The worked example also shows a bleach-feed estimate; confirm product strength and density before setting a pump.

Chlorine (lbs/day) = Dose (mg/L) × Flow (MGD) × 8.34

2.5 mg/L × 1.5 MGD × 8.34 = 31.275 lbs/day of 100% available chlorine. That equals about 30 gallons/day of 12.5% sodium hypochlorite.