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Operator Math
Davidson Pie Chart
Three Names, One Formula
Demand, Strength and Purity
Cost and Days of Supply
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Operator Math
Davidson Pie Chart
Calculate feed rate, dose, or flow.
Choose what you’re solving for
1
lb/day
2
Dose
3
Flow
lb/day
POUNDS PER DAY
dose
mg/L
flow
MGD
8.34
lb/gal
Solve for lb/day
2.0
DOSE
MG/L
×
8.34
LB PER
GALLON
×
0.5
FLOW
MGD
=
8.3
LB/DAY
lb/day
POUNDS PER DAY
dose
mg/L
flow
MGD
8.34
lb/gal
Solve for Dose
20
FEED RATE
LB/DAY
÷
(
8.34
LB PER
GALLON
×
1.0
FLOW
MGD
)
=
2.4
DOSE · MG/L
lb/day
POUNDS PER DAY
dose
mg/L
flow
MGD
8.34
lb/gal
Solve for Flow
50
FEED RATE
LB/DAY
÷
(
3.0
DOSE
MG/L
×
8.34
LB PER
GALLON
)
=
2.0
FLOW · MGD