The water treatment is the targeted change of the water quality. It is a branch of process engineering and essentially comprises two groups of treatment: removal of substances from the water, addition of substances and adjustment of water parameters. In order to treat the water, it usually passes through a large number of pipelines to be treated and finally to the area of use. In order to guarantee the existing quality of water treatment, flexible pipe connections are necessary to stabilize the pipelines. The flexible elements are used to compensate, for example, movements, temperature differences or to dampen noise and vibration transmission, as well as to compensate ground and foundation settlement.