Cooling Water Chemistry and Cycles — online
Scaling and corrosion indices, safe cycles, acid feed and the full cost of your treatment programme.
Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 49) — the Guide, method and references are in the Excel file.
What this cooling water chemistry and cycles calculator does
Run your cooling water at the highest safe cycles — and see what it saves. Scaling and corrosion indices, safe cycles, acid feed and the full cost of your treatment programme.
- All the indices. LSI, RSI, PSI and Larson-Skold at bulk and skin temperature, at current and recommended cycles.
- Which limit comes first. Calcium carbonate, calcium sulfate, silica, magnesium silicate, chloride and conductivity — the governing limit sets the recommended cycles.
- Acid feed. Acid dose to reach a target alkalinity or pH, and the sulfate it adds.
- Treatment programme cost. Each product by its general function, dose basis and price; actual versus recommended use.
- Recommendations. A ranked list of findings, from low oxidant at high pH to overdosed products.
- Generic chemistry only. No supplier names; works for any treatment programme.
What you enter
- Circulating water pH
- Acid feed
- Treatment programme
- Oxidising biocide
- Evaporation factor
- Custom evaporation factor
- Current cycles
- Reference for cycles
- Carbon steel in the system
- Copper alloys in the system
- Stainless steel in the system
- Galvanized steel in the system
- Conductivity
- Total dissolved solids (optional)
What you get
- Total dissolved solids used
- Ion balance error (cations − anions)
- Chloride corrected for oxidant
- Magnesium
- Sodium
- Calcium
- Orthophosphate
- Iron
- Current cycles used
- Calcium sulfate (Ca × SO₄)
- Magnesium silicate (Mg × SiO₂)
- Chloride (stainless steel)
- Physical limit from drift, (E + D) ÷ D
- Maximum safe cycles
Related
- Free quick calculator — a simpler free version for a fast estimate.
- Calculation guide — the equations behind this tool, with a worked example.
- Cooling Water Chemistry and Cycles Excel tool — USD 49, keep the workbook and its Guide.
- All 40 online tools
Questions
Is the cooling water chemistry and cycles calculator free?
You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all 40 online tools (USD 15) or a yearly one (USD 99).
Are the results the same as the Excel tool?
Yes. The online tool runs the formulas of the Cooling Water Chemistry and Cycles Excel workbook, checked cell by cell against the Excel file.
Which units can I use?
SI, US customary and British units — choose the unit next to each input.