01 / AT THE PLANT
No signal required.
The tables and calculations live on your device. Open the app once, then keep the reference close.
WATER TREATMENT / A POCKET REFERENCE
The right CT.
Right where
you need it.
Disinfection calculations from the EPA’s published tables. Enter the conditions and get a reading, even when you’re offline.
Open CT Calc ↗FOUR DISINFECTANTS · GIARDIA & VIRUSES
FIELD NOTE / WORKED EXAMPLE
Free chlorine → Giardia
- Temperature
- 5 °C
- Residual
- 1.0 mg/L
- pH
- 7.0
- Inactivation
- 2-log
CT REQUIRED / TABLE INTERPOLATION99.0mg·min/L
The manual’s regression gives 107 mg·min/L for the same conditions.
02 / BETWEEN ROWS
Read between the values.
Interpolation across temperature, and across residual and pH for free chlorine against Giardia.
03 / DEFINED LIMITS
The range stays explicit.
Conditions outside the published tables are refused. Cryptosporidium is not covered.
What it covers
Giardia from 0.5-log to 3-log inactivation in half-log steps, and viruses at 2-log, 3-log and 4-log — to 25 °C, for every disinfectant the manual tabulates. Cryptosporidium is not covered.
| Disinfectant | From | Varies over |
|---|---|---|
| Free chlorine | 0.5 °C | Temperature, residual and pH |
| Chloramine | 1 °C | Temperature |
| Chlorine dioxide | 1 °C | Temperature |
| Ozone | 1 °C | Temperature |
READY WHEN YOU ARE