Closed Loop Dosing

Calculate the number of solid inhibitor tablets or sticks required to raise a closed loop HVAC system from its current inhibitor concentration to target. Select the product and form, enter system volume and both concentrations, and the calculator returns tablet count and total product weight.


Understanding Closed Loop Dosing

How many tablets or sticks are needed to reach a target concentration?
The calculator finds the product mass needed to raise the system from its current inhibitor concentration to target — (target − current) ÷ control percent × system volume, converted to pounds — then divides by the unit weight of the selected tablet or stick and rounds up to whole units.
What is inhibitor control percent?
Control percent is the fraction of the product that contributes to the measured inhibitor residual. It links product weight to the ppm the field test reads, so the dosing math reflects what the test measures.
Should I use tablets or sticks?
Both deliver the same chemistry; the choice depends on the dosing pot or feeder and the dose size. Larger systems or bigger step changes favor sticks (greater unit weight), while tablets allow finer increments.
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