When is a backflow preventer required?
If, in individual cases, the required head above the backwater level cannot be maintained, and if the calm water level is below the backwater level, the separator must be protected against backwater from the sewer in the direction of flow downstream of the separator system.
Installation
Downstream Aqualift XL-Duo pumping station behind a light liquid separator
(copy 2)
If the inflow cannot be stopped, the separator must be fitted with a lifting station or a hybrid lifting station. This applies, for example, to uncovered washing areas: in such cases, the drain point is essential and the water must be pumped out.
Further information can be found in the section on backwater
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