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
LSI/RSI are calculated at skin (heat transfer surface) temperature. Silica saturation is calculated at cold water basin temperature — where amorphous silica is least soluble.
Program Questions
Answer to enable accurate CoC consistency checks and contextual warnings.
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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
Ryznar Stability Index (RSI)
Silica Saturation Assessment
Evaluated at cold water basin temperature — amorphous silica is normally soluble (precipitates at lowest system temperature, not at heat transfer surfaces).
Magnesium Silicate Saturation Risk
Industry index: Mg(as CaCO₃) × SiO₂. Inversely soluble with temperature and pH. SI = log₁₀(product / pH threshold) — SI > 0 indicates precipitation risk. Thresholds: 12,000 (pH 7.5–8.5) and 3,000 (pH > 8.5) per Meyers IWC-99-64.
Calcium Magnesium Silicate Saturation Risk
Industry index: (Ca+Mg)(as CaCO₃) × SiO₂. Inversely soluble with temperature and pH. SI = log₁₀(product / 50,000) — risk is pH-gated: no flag below pH 8.4, caution 8.4–8.6, elevated risk above pH 8.6.
Calcium Sulfate Saturation Risk
Saturation Ratio (SR) = [Ca²⁺][SO₄²⁻] / Ksp. Evaluated at skin temperature — gypsum solubility decreases with temperature above ~40°C. SR > 0.8 warrants attention; SR > 1.0 indicates precipitation risk.