Water • Treatment Microsoft Excel (.xlsx)
Disinfection CT (Chlorine Contact)
Verify chlorine residual أ— contact time against pathogen inactivation requirement.
Download Excel Workbook (.xlsx)
Version 0.1
What this workbook is
A real, downloadable Microsoft Excel workbook — not a rendered demo. Every sheet is built around a single engineering method: inputs in one place, calculated results and a PASS / WARN / FAIL check sheet, with the method, sources and assumptions recorded next to the numbers. Open it in Excel, Sheets or LibreOffice, change the inputs, and the workbook recalculates.
- Light cells are user-entered inputs on the Inputs sheet.
- Dark cells are calculated automatically and are not editable.
- The method and sources for every calculation are listed below and inside the workbook.
What you enter
- ✓Chlorine residual (mg/L)
- ✓Contact volume
- ✓Peak flow
- ✓Baffling / T10 factor
What it calculates
- ✓T10 contact time
- ✓CT achieved
- ✓CT required (user)
- ✓PASS / WARN check
Method
CT = C أ— T; T10 = TDT أ— baffling factor; compare with required CT (user/regulatory)
Sources
- [1] US EPA SWTR & disinfection profiling guidance (CT method)
Inside the workbook
CoverTitle, scope and revision block
SummaryCore inputs and headline results
InputsYour project values (light cells)
CalculationsStep-by-step working sheet (dark cells)
OutputsReadback of results for reporting
ChecksPASS / WARN / FAIL against stated limits
ReferenceSources for each calculation
Notes & AssumptionsScope, exclusions and stated limits