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Calcimator

Fluoride Addition Calculator

Calculate chemical feed rate for water fluoridation to achieve target concentration using NaF, fluorosilicic acid, or sodium fluorosilicate.

Inputs

MGD
mg/L
mg/L

Results

Fluoride to Add

0.6 mg/L

Chemical Feed Rate

19.34 lbs/day

Chemical UsedFluorosilicic Acid (H₂SiF₆)
Solution Feed Rate8.2 gpd
Target ComplianceWithin recommended range (0.6-1.0 mg/L)
Annual Chemical Usage7,060 lbs
Annual Chemical Cost$1,059.00
30-Day Storage Needed246
Annual Gallons2,992.13
How to Use This Calculator
  1. Enter Plant Flow Rate (MGD) — the total flow that will receive fluoride treatment.
  2. Set Target Fluoride Level (mg/L) to the CDC-recommended optimal level of 0.7 mg/L.
  3. Enter Natural Fluoride Level (mg/L) from your source water monitoring data.
  4. Select Fluoride Chemical (sodium fluoride, fluorosilicic acid, or sodium fluorosilicate) and enter Chemical Purity (%).
  5. Review Fluoride to Add (mg/L) and Chemical Feed Rate (lbs/day) to configure your chemical feed system.
  6. Check Compliance Status to confirm the target level is within the EPA maximum contaminant level of 4.0 mg/L.

How the result changes with Target Fluoride Level

Target Fluoride LevelFluoride to AddChemical Feed Rate
0.290.19 mg/L6.12 lbs/day
0.770.67 mg/L21.44 lbs/day
1.331.23 mg/L39.65 lbs/day
1.811.71 mg/L55.12 lbs/day

What each input means

Plant Flow Rate
Average water flow rate in million gallons per day.
Target Fluoride Level
Desired fluoride concentration. CDC recommends 0.7 mg/L.
Natural Fluoride Level
Naturally occurring fluoride in the source water.
Fluoride Chemical
1 = Sodium Fluoride (NaF), 2 = Fluorosilicic Acid (H₂SiF₆), 3 = Sodium Fluorosilicate (Na₂SiF₆).
Chemical Purity
Purity of the fluoride chemical as delivered.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Plant Flow Rate = 3, Target Fluoride Level = 0.7, Natural Fluoride Level = 0.1, Fluoride Chemical = 2 = 5 input(s) provided
  2. Calculate Fluoride to Add
    Fluoride to Add
    0.6 = 0.6
  3. Calculate Chemical Feed Rate
    Chemical Feed Rate
    19.34 = 19.34
  4. Calculate Chemical Used
    Chemical Used = chem.name
    Fluorosilicic Acid (H₂SiF₆) = Fluorosilicic Acid (H₂SiF₆)
  5. Calculate Solution Feed Rate
    Solution Feed Rate
    8.2 = 8.2

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