Plumbing Aggressive Index Calculator
Declared AWWAC400aggressive index AI=pH+log10(AH), Aalkalinity/Hcalciumhardnessmg/L asCaCO3. Not Langelier SAT index, conductivity or corrodes-any-material verdict. Actual independently matched units, regime, material/equipment and governing references; not a hydraulic code, safe pressure, water pot ability or operational approval.
Description
An aggressive index combines measured pH, alkalinity and calcium hardness under a stated convention.
An aggressive index combines measured pH, alkalinity and calcium hardness under a stated convention.1
It differs from a saturation index and does not establish corrosion for every material. The calculation and input requirements are explained below.
When to use Plumbing Aggressive Index Calculator
Enter finite measured pH and positive alkalinity and calcium hardness in mg/L as CaCO3.
How to use Plumbing Aggressive Index Calculator and how it works
- Prepare the measurements or independently established model inputs described below, with matching units and observation scope.
- Enter the required fields and run Plumbing Aggressive Index Calculator.
- Read the result fields using the formula, output units, signs and ordering explained below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualMeasuredPh | Actual Measured Ph. Use the units and matching context stated in the calculation below. | number | Required; finite; other constraints below |
| actualAlkalinityMgPerLiterAsCaco3 | Actual Alkalinity Mg Per Liter As Caco3. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
| actualCalciumHardnessMgPerLiterAsCaco3 | Actual Calcium Hardness Mg Per Liter As Caco3. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
Enter finite measured pH and positive alkalinity and calcium hardness in mg/L as CaCO3. Return pH+log10(alkalinity*hardness). No universal aggression band or material-corrosion verdict is assigned.
aggressiveIndex=pH+log10(alkalinity*calciumHardness) Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Numeric result under the formula and output units explained above. | number |
{
"input": {
"actualMeasuredPh": 8,
"actualAlkalinityMgPerLiterAsCaco3": 10,
"actualCalciumHardnessMgPerLiterAsCaco3": 10
},
"output": {
"result": {
"value": 10
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Plumbing Water Softener Regeneration Frequency Calculator for a complementary operation: A softener's exhaustion interval compares usable exchange capacity with daily hardness load.
Use Plumbing Water Hardness Grains Per Gallon Calculator for a complementary operation: Water hardness is often expressed as calcium-carbonate-equivalent mass per volume.
References
-
Plumbing Aggressive Index Calculator — tool.io
Similar or alternative tools
- Plumbing Water Softener Regeneration Frequency Calculator
A softener's exhaustion interval compares usable exchange capacity with daily hardness load.
- Plumbing Water Hardness Grains Per Gallon Calculator
Water hardness is often expressed as calcium-carbonate-equivalent mass per volume.