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There are two methods of disinfecting water pipes: thermal and chemical. These need to be used with great care. In this guide we explain how to disinfect water pipes at home.
In a nutshell:
- Thermal disinfection of KAN-therm pipes is carried out with hot water (70°C);
- Chemical disinfection involves filling and flushing the system with a disinfectant (see table for a list of chemicals).
If you have any questions or concerns about disinfecting your water system, please contact our technical advisors.
Disinfection of the KAN-therm water installation
KAN-therm systems (except from KAN-therm Steel) are suitable for the construction of drinking water installations and have the necessary hygiene certificates. The selection of construction materials does not affect the multiplication of pathogenic organisms or deterioration of the properties of drinking water.
Disinfection of water pipes may be necessary as a result of:
- Faults in the construction process
- Errors in the use of installation
- Periods of non-use of the water system
- Contamination of the tap water
It should be remembered that disinfection removes only the effects of contamination - before it is carried out, the causes of contamination of the medium must be removed.
Thermal disinfection of water pipes
Thermal disinfection is performed with clean, treated water at an increased temperature.
In order to effectively carry out thermal disinfection, it must be ensured that at all points of tap water consumption there is an outflow of water at a temperature of 70 °C in not less than 3 minutes.
Care must be taken to ensure that the permissible operating parameters (maximum permissible temperature as a function of operating pressure) of the relevant installation system are not exceeded at any point in the installation.
At the same time, it is necessary to ensure the safety of all users of the given installation (minimize the risk of burns).
Please note that the operation of the installation at elevated temperatures shortens the service life of the construction materials used, therefore it should be performed only periodically.
Chemical disinfection - decontamination of water installations
Chemical disinfection can be performed in drinking water installations made of all KAN-therm systems.
It is carried out at ambient temperature (not higher than 25 °C) with the use of reagent doses and exposure time specified by the compound manufacturer. Before using a chemical agent, it is necessary to obtain a written confirmation that it does not adversely affect the components of the installation. During chemical disinfection, water should not be drawn from the system for drinking purposes.
Examples of chemical disinfection agents approved for use with KAN‑therm systems:
|
Name of the substance |
Max. permissible concentration |
Time of reaction |
|
Hydrogen peroxide H2O2 |
150 mg/l of active ingredient |
max. 12 h |
|
Sodium hypochlorite NaOCl |
50 mg/l of active ingredient |
|
|
Calcium hypochlorite Ca(OCl)2 |
50 mg/l of active ingredient |
|
|
Chlorine dioxide ClO2 |
6 mg/l of active ingredient |
The above‑mentioned concentrations and reaction times of the substances must not be exceeded at any point in the installation. Use personal protective equipment when dosing chemicals. It is unacceptable to use a combination of thermal disinfection and chemical disinfection.
