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There are two methods of disinfecting water mains: thermal and chemical. These must be used with the utmost care. In this guide, we explain how to clean water pipes at home.
In a nutshell:
- Thermal disinfection of KAN-therm pipes is carried out using hot water ( 70 °C);
- Chemical disinfection consists of filling and flushing the installation with a disinfectant (see table for list of chemicals).
If you have any questions or concerns about disinfecting your water system, please contact our technical advisors.
Disinfection of the water system
KAN-therm systems (with the exception of KAN‑therm Steel) are suitable for constructing installations, drinking water and have the necessary hygienic certificates. The selection of construction materials does not affect the multiplication of pathogenic microorganisms or the deterioration of drinking water properties.
Disinfection of water pipes may be necessary as a result:
- errors in the construction process,
- errors when using the installation,
- periods of downtime in the use of the water system,
- tap water contamination.
It is important to remember that disinfection only removes the effects of the contamination - the causes of the contamination of the medium must be eliminated before it is carried out.
Thermal disinfection of water pipes
Thermal disinfection is carried out with clean treated water at an elevated temperature.
For effective thermal disinfection, it must be ensured that water at a temperature of 70 °C is discharged at all points of use within a minimum of 3 minutes.
Care must be taken to ensure that the permissible operating parameters (permissible maximum temperature as a function of operating pressure) of the installation system are not exceeded at any point. At the same time, the safety of all users of the installation in question must be ensured (minimise the risk of scalding).
Please note that operation of the installation at elevated temperatures shortens the service life of the construction materials used and should therefore only be carried out periodically.
Chemical disinfection - decontamination of water installations
Chemical disinfection can be carried out in drinking water installations made from components of all KAN-therm systems.
Chemical disinfection is carried out at ambient temperature (not higher than 25 °C) using the dosage of reagents and duration of action specified by the manufacturer of the preparation.
Before using the chemical disinfectant, written confirmation must be obtained that there are no adverse effects on the system components. When carrying out chemical disinfection, the intake of water from the system for drinking purposes must be prevented.
Examples of chemical disinfectants approved for use with KAN-therm systems :
|
Name of substance |
Max. permissible concentration |
Operating time in the installation |
|
Hydrogen peroxide H2O2 |
150 mg/l of active substance |
max. 12 h |
|
Sodium hypochlorite NaOCl |
50 mg/l of active substance |
|
|
Calcium hypochlorite Ca(OCl)2 |
50 mg/l of active substance |
|
|
Chlorine dioxide ClO2 |
6 mg/l of active substance |
The stated concentrations and times of action of the substances must not be exceeded at any point.
The concentrations and durations given above must not be exceeded at any point in the installation.
Use personal protective equipment when dispensing chemicals. A combination of thermal disinfection and chemical disinfection is not permitted.
