Chemical Metering-Pump Setting

Neat chemical (lb/day), solution feed (GPD and mL/min), and pump setting (% of max) from plant flow, target dose.

Run the calculator

Example

You enter

Plant flow (MGD) 0.5
Target dose (mg/L) 8
Solution strength (% active) 10.78
Solution specific gravity 1.16
Pump max output (GPD) 50

You get

Pump setting 64
Solution feed 31.99

Checked against published worked examples from: Pounds formula (AWWA / EPA water-operator practice).

Details, formula, and sources

ScopeSolution strength, and specific gravity via the pounds formula.

Formula or tablepure lb/day = MGD*dose*8.34; solution lb/day = pure/(strength/100); GPD = solution_lb_day/(8.34*SG); mL/min = GPD*3785.41/1440; setting% = GPD/pump_max*100.

Source and editionPounds-formula basis (lb/day = MGD x mg/L x 8.34), standard AWWA / EPA water-operator practice, by name.

Free accessPublic pounds formula; the operator of record and primacy agency govern.

What governsEstimate. AHJ and licensed professional govern.

API field namesflow_mgd, dose_mgl, strength_pct, sg, pump_max_gpd, setting_pct, solution_gpd

8.34 lb/gal weight of one gallon of waterpounds formula