Sodium Hypochlorite Filter Dosing Calculator

Filter Basin Parameters

Filter Basin Volume (gallons): Note: Our filters are typically 35,000 gallons

Sodium Hypochlorite Concentration (%): Note: Our normal hypochlorite concentration is 10%

Desired Filter Basin Residual Increase (mg/L or ppm):

🧪 Filter Basin Dosage Required

📊 How This Was Calculated

Basic Formula: Dosage (lbs) = (Desired mg/L × Volume MG × 8.34) ÷ (Chemical Strength × Available Chlorine)
Volume (gal) = Dosage (lbs) ÷ (Specific Gravity × 8.34)

Key Constants:
• 8.34 = lbs per gallon of water
• 1.1 = specific gravity of 10% sodium hypochlorite
• 0.96 = available chlorine factor (96%)
• MG = million gallons (basin volume ÷ 1,000,000)
• 128 = fluid ounces per gallon
• 3,785.41 = milliliters per gallon

⚠️ Important Note: This calculation is for filter basin chemical addition to increase residual levels. It assumes uniform mixing and does not account for chlorine demand or decay. Always verify with residual testing and adjust based on actual filter basin conditions.