In nature, micro-organisms are an important component of water and significantly contribute to the purification of water in the soil and in surface water. The goal of extracting and treating water is not to get rid of all of the micro-organisms.
Therefore, good, high quality water contains a higher or lower amount of microbiological germs. During the treatment and distribution of water, technical measures must therefore be taken in order to avoid the inadmissible propagation of the micro-organisms.
The Drinking Water Ordinance (TrinkwV) prescribes observing at least the general technical rules and specifies limits for the germs and water contents which must be complied with.
Among other things, limescale deposits in pipelines and hot water tanks lead to the micro-organisms becoming permanently established, multiplying unchecked and creating a thick biofilm. For hygienic reasons, the limescale build-up must therefore be minimised for the purpose of meeting the generally accepted technical rules.
1) Avoid over-sizing of pipes.
2) Keep hot water tanks as small as possible to ensure more frequent water exchange.
3) If possible, replace the hot water tank with an up-to-date fresh water system.
4) Plan measures to protect against corrosion and limescale buildup according to water quality on-site.
1) Avoid or remove disused pipes.
2) Insulate cold water pipes to keep the cold water temperature below 20 °C.
3) Choose material based on local water quality to avoid corrosion.
4) Install a limescale protection device according to DIN 1988-200.
OPERATION & MAINTENANCE
1) Avoid stagnation, forced flushing at end lines or during holiday periods for schools and student halls.
2) Set the hot water temperature in the tank to at least 60 °C.
3) Measure and record the usage of limescale prevention agents every week.
4) Create a maintenance plan relevant to the current standards (VDI 6023, EN 806-5 etc.) and the manufacturer’s specifications for components.
1) Keep the water installation in good condition according to the maintenance plan (VDI 6023, EN 806-5 etc.) and the specifications of the device component manufacturer.
2) Insulate cold water pipes in existing installations to keep the cold water temperature below 20 °C.