Step 2: Monitoring

Continuous monitoring ensures that drinking water hygiene remains at a high level during object operation. For influencing factors such as irregular use or the heating of the cold drinking water during stagnation can lead to health-endangering germ load.

Hycleen – In four steps for optimal drinking water hygiene

The monitoring process takes into account the existing drinking water quality as well as the type of building. The following procedures are recommended for successful monitoring:

Measure 1: Temperature monitoring
Hycleen - Temperature profile in the building water inlet of a hospitalTemperature profile in the building water inlet of a hospital

Drinking water installation systems should be monitored throughout their usage. The monitoring of the cold water and hot water temperatures is the simplest approach to the risk reduction in drinking water hygiene. The temperature is an indirect parameter but has a direct relationship to the risk of germs. If the cold drinking water does not heat above 25 °C, the risk of contamination is low. If temperatures of more than 50 °C are measured in the hot water distribution, especially in the circulation flow, no germs can be expected. It is advisable to monitor the temperatures in cold and hot water at all times online.

Measure 2: Microbiological sampling
Biofilm with bacteriaBiofilm with bacteria

Disease-causing bacteria are present in many waters in very low concentrations and do not affect our health in any way. If a stable drinking water quality with the number of bacteria is detected, an increased number of pathogens is not to be expected. If, however, temperature increases of between 25 ° to 50 °C occur, the growth of legionellae may occur, for example, in this temperature range. If nutrients are present in increased amounts and long periods of stagnation, explosion-like multiplication can occur, which leads to an increased risk of disease for drinking water users. Unfortunately, there are more and more buildings in which a chain of unfavourable conditions for the maintenance of the drinking water quality results in high legionella contamination and so persons with a weak immune system can catch a legionella infection, particularly during showering.

Sampling is necessary to ensure water quality and to test the bacterial concentration in drinking water. This allows operators to identify and react to problems early.

Measures 3: Regular sampling

In order to obtain an indicator of the quality of drinking water, a regular measurement of the germ load is increasingly being used today. Changes in the number of bacteria give an indication concerning the stability of the drinking water and point to dispensing points with high germ concentrations. The sampling on bacteria should be carried out periodically in cold and warm drinking water depending on the type of object. Critical building areas should be compulsorily included.

The sample collection points are usually determined by the team, whereby it is advisable to cooperate with planners, technicians, microbiologists and medical professionals. Only in this way can all aspects of the sampling, the equipment as well as the users be satisfied in an acceptable manner.

One of the biggest sources of error is the sampling itself, since the disinfection of the sampling site is often carried out inadequately. Sampling valves are used to aid in this respect and these have temperature indicators or sampling point angle valves with a sterile one-way part.

It is recommended to extend the sampling to Pseudomonas aeruginosa in the cold drinking water as these can cause infection in open wounds.


Product overview & services

JRG Probenahmeventil

For microbiological water analysis with temperature indicator

JRG sampling removal valve

JRG Probenahme Eckventil

The metal-sealing and non-greased valve

JRG sampling angle valve

JRG Temperaturfühler PT 1000

For connection to the building control system

JRG temperature sensor PT 1000

JRG LegioTherm

The circulation control system with integrated temperature monitoring

JRG LegioTherm System

Legionellae sampling

in drinking water installations, inspection and maintenance as well as preparation of a maintenance manual: Ensuring functional safety in the drinking water installation

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