Quite often, grey water and black water cannot be carried off because the sewer is higher than the drainage point in the cellar. In this case, a lifting station or pump has to be used. Lifting stations pump the wastewater into the sewer via pressure pipes. According to DIN 12056-4 the pressure pipe must be routed above the backwater level.

A distinction is made between two types of wastewater:

Wastewater without sewage (grey water):
Domestic wastewater from washing machines, showers and bathtubs. The Aqualift® S and Minilift can normally be used for drainage purposes.

Wastewater with sewage (black water):
When toilets and urinals need draining, sewage lifting stations must be used. The lifting stations of the type Aqualift® F are available for optional installation inside or outside buildings. All lifting stations are also available as twin stations.

The pressure pipe must be above the backwater level

Dimensioning of the pump capacity must be done according to DIN EN 12056-4. The overall feed flow and overall pumping height must be determined for this purpose. The pump has to be designed in such a way that the flow rate determined can be pumped over the required height. Avoid making the pump significantly larger than necessary in order to keep energy consumption to an appropriate level. The flowing speed in the pressure pipe must not fall short of 0.7 m/s as otherwise deposits will occur and lead to blockages sooner or later. Quite often, the pressure pipe is not routed over the backwater level as a backwater loop. The pressure pipe is routed upwards, but only to the cellar ceiling. If this is below the backwater level, the water from the sewer can force its way into the pressure pipe to the lifting station. The backflow protection device used here, which is only to prevent the pressure pipe from running dry, does not represent safe protection from backwater.

The right lifting station

Reliable functioning depends on the right system selection and the correct technical installation of the system. A distinction is made between non-chokable pumps and macerator pumps.

Non-chokable pumps are particularly suitable where water carries solid and long fibrous substances (e.g. sanitary towels, textiles etc.). A further characteristic is the low noise emission. This allows wastewater to be transported reliably through larger pressure pipes (DN 100 and 80) over shorter distances.

Macerator pumps are particularly suitable for long fibres and where solid bodies can be comminuted, even in larger sizes. This allows wastewater to be transported reliably through small pressure pipes even over long distances (pressure drainage).

Connections and adapters

All lifting stations for wastewater with sewage are fitted with backwater flaps as standard and can be connected to conventional pressure pipe systems made of polymer or SML pipe quite easily. For the connection of pressure pipes made of other materials, specialist retailers have a large range of adapters available.

Requirement	Product
To lift wastewater with or without sewage to the sewer	Lifting stations for wastewater with sewage inside buildings
To lift wastewater without sewage to the sewer	Lifting stations for washwater inside buildings
Creating living accomodation in the cellar	Lifting stations and pumping stations outside buildings
Sump	Submersible pumps

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