Chemical Dose & Feed Rate
Convert a treatment dose into active chemical mass, solution feed and storage use.
Calculator inputs
Results
Equations and method
Active mass = water flow × dose. Solution mass = active mass ÷ mass fraction. Solution volume = solution mass ÷ density.
Worked example
At 500 gpm and 10 mg/L: active chemical = 60.09 lb/day. At 12.5% by mass and 1.2 kg/L, solution feed = 2.00 gal/h.
Scope and assumptions
Use strength on the same active-chemical basis as the dose. Available chlorine and sodium hypochlorite mass percent are different bases. Density is required for mass-percent solutions. Operating time affects daily use, not the instantaneous feed rate.
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Equation values and input guide
Enter water flow and the required active dose, then product strength and density on the same chemical basis. Set actual operating hours and usable inventory to estimate daily consumption and storage duration.
- Water flow and dose
- Water volume per time and active chemical mass per water volume (mg/L). Their product is active mass per time after unit conversion.
- Active mass fraction
- Mass of active chemical divided by solution mass. Enter percent; 12.5% is 0.125 in the equation. Verify the label’s chemical basis.
- Solution density
- Mass of solution per volume in kg/L, obtained from supplier data at the relevant concentration and temperature.
- Solution mass and volume
- Required active mass divided by mass fraction gives solution mass; dividing by density gives solution volume.
- Operating time, usable storage
- Actual dosing hours per day and accessible solution volume. Daily volume is hourly solution feed times hours; storage duration is usable inventory divided by daily use.
Use the unit selectors beside the inputs. Units shown in the equations must be consistent when checking the math by hand.