Dilution math you can check before the tank.

The batch-mix equation

For a simple SH-and-water batch, the calculator uses the same dilution relationship you could check on paper:

The remaining volume is water after any optional surfactant displacement. Percent values must use the same basis, and every volume stays in the selected unit.

What each input means

Final volume

The finished amount you intend to have in the tank or container—not the tank’s maximum label unless you actually intend to fill it to that point.

Source strength

The current sodium hypochlorite strength shown on the product label or otherwise verified from an authoritative product source. Age, storage, and handling can affect actual strength; the app cannot measure it.

Target strength

The concentration selected through your training, product documentation, surface assessment, equipment instructions, and local requirements. Batch Mix does not recommend a target for a surface.

Gallons and liters

Choose the unit already used for the work. The relationship is the same in either unit, and the output stays consistent with the selected unit. Do not mix units across inputs outside the app.

Surfactant stays inside the final volume

Surfactant Helper can treat an additive amount as volume displacement. That prevents the additive from being silently placed on top of the intended final batch. The helper does not select a surfactant, prove chemical compatibility, or decide an application rate.

Tank mixing is not downstream injection

The Basic Calculator plans a batch in a tank or container. A downstream injector changes the delivered concentration after equipment draws and combines fluids. Advanced Mode estimates that output separately.

Real draw rates vary with the injector, hose length, tip, pressure, chemical viscosity, wear, and setup. Bucket-test the actual equipment before relying on an estimate.

A math example—not a surface recipe

For ten units of final volume at a one-percent target from a ten-percent source, the equation produces one unit of source and nine units of water before any additive displacement. This example explains arithmetic only. It is not a recommendation for any surface, chemical, or job.

Read the full Batch Mix safety guidance →