How do you calculate a pretreatment bath addition?

Multiply the points gap by the supplier's points-to-gallons factor. The example's bath at 100 against a 110 target with a 1.08 factor needs (110 − 100) × 1.08 = 10.8 gallons.

What does the points-to-gallons factor represent?

Gallons of concentrate that raise this tank by one titration point: product strength and tank volume folded into one number. Re-confirm it after any tank volume change.

What if the bath reads below the lower control limit?

Two problems: production since the last good titration ran through an uncertified bath, so check recent racks before shipping, and the bath needs its dose now.

Should I dose to the target or the band midpoint?

Target dosing restores the setpoint but oscillates on stages with heavy drag-out. Midpoint dosing uses smaller corrections, 2.7 gallons against 10.8 in the example. Pick one and log it.

Finishing calculator

Pretreatment Bath Concentration Calculator: Titration Into Gallons

Convert a titration reading into the dose. Enter measured points, the supplier's points-to-gallons factor, the target and the band's lower limit; the page returns gallons and the floor margin.

What this calculator does

Turn a bath titration into the gallons that restore it, with the margin to the control band's floor.

Formula used

Concentration gap = target points − measured points
Chemical addition = concentration gap × points-to-gallons factor
Margin above lower limit = measured points − lower control limit
Dose to midpoint = ((target + lower limit) ÷ 2 − measured) × factor

Inputs explained

Titration Reading: Measured concentration in titration points from the control sheet.
Points-To-Gallons Factor: Gallons of concentrate that raise this tank one point.
Target Concentration: The control sheet's target for this stage.
Lower Control Limit: The band's certified floor for this stage.

How to use the result

Best suited to converting the morning titration into a dose, judging a low reading against the certified floor, choosing target dosing or midpoint dosing.
Titration reads total or free alkalinity; contamination that hides from the endpoint is invisible. The linear factor holds inside the normal band; a badly depleted bath may not respond. Temperature, pressure and contact time carry the other half of cleaning.

Current U.S. benchmarks

Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate a pretreatment bath addition? Multiply the points gap by the supplier's points-to-gallons factor. The example's bath at 100 against a 110 target with a 1.08 factor needs (110 − 100) × 1.08 = 10.8 gallons.
What does the points-to-gallons factor represent? Gallons of concentrate that raise this tank by one titration point: product strength and tank volume folded into one number. Re-confirm it after any tank volume change.
What if the bath reads below the lower control limit? Two problems: production since the last good titration ran through an uncertified bath, so check recent racks before shipping, and the bath needs its dose now.
Should I dose to the target or the band midpoint? Target dosing restores the setpoint but oscillates on stages with heavy drag-out. Midpoint dosing uses smaller corrections, 2.7 gallons against 10.8 in the example. Pick one and log it.

Last reviewed 2026-10-01.