A characteristic feature of chlorination systems to
DIN 19 606 is that the chlorine gas to be metered is
maintained at subatmospheric pressure and therefore
in a range which is proof against leakages.
Any leaks would merely cause air to enter the system,
but would not allow chlorine gas to escape.
The water jet pump or ejector as it is commonly known
has proved its value here for decades, since
the ejector does not have any moving parts subject to
wear and because it not only generates a vacuum,
but also mixes the chlorine gas and water.
The water required for operation of the ejector is
the chlorine gas to form a chlorine solution which is
added to the drinking or bathing water to be treated.