Unit Settings
Select your preferred input units before entering water analyses.
Water Analysis
Enter your makeup (source) and cycled (system) water analyses. Enter 0 or leave blank for unmeasured parameters.
| Ion | Reported As | Note | Makeup Water (mg/L) |
Cycled Water (mg/L) |
|---|---|---|---|---|
| Calcium | as CaCO₃ | |||
| Magnesium | as CaCO₃ | |||
| Total Alkalinity (M-Alk) | as CaCO₃ | Bicarbonate + Carbonate | ||
| Chloride | as Cl⁻ | |||
| Sulfate | as SO₄²⁻ | |||
| Silica | as SiO₂ | |||
| Iron (Total) | as Fe | |||
| Phosphate (Total) | as PO₄ | Leave blank if not measured | ||
| Sodium | as Na⁺ | |||
| Potassium | as K⁺ | Optional | ||
| TDS | mg/L (always) | Optional — used for cross-check only | ||
| pH | standard units | Required for LSI / RSI |
Temperature
Used for LSI calculation at heat transfer surface. LSI at bulk water temperature understates scale risk.
If unknown, add 20°F (11°C) to exit temperature above. Skin temperature drives scale formation — not bulk water temperature.
Program Questions
Answer to enable accurate CoC consistency checks and contextual warnings.
Do you feed acid for pH control?
Do you feed chlorine or a chlorine derivative (bleach, BCDMH, trichlor, stabilized chlorine, etc.) as a biocide?
Do you feed any inorganic, complex, or organic phosphate as a corrosion/scale inhibitor?
All calculations are performed locally in your browser. No data is stored or transmitted unless you request a free review.
Analysis Results
Summary Flags & Warnings
Cycles of Concentration
CoC calculated per ion. Conservative (non-precipitating) ions — Cl, SO₄, Na — establish the reference CoC. Deviations ≥5% in reactive ions indicate potential precipitation or other consumption.
| Ion | Makeup (mg/L) | Cycled (mg/L) | CoC | Notes / Flags |
|---|
LSI at Skin Temperature
—
−3 (corrosive)
0 (balanced)
+3 (scale)
Ryznar Stability Index (RSI)
—
Silica Assessment
—