Treatment of Raw Water from Lake Constance

Sipplinger Berg Waterworks

The Lake Constance Water Supply Authority extracts more than 130 million m³ of water every year from locations 60 m below the lake’s surface. EVERZIT® N plays an essential part in ensuring clear and pure supply from Europe’s biggest drinking water reservoir to some four million consumers in surrounding areas.

The Sipplinger Berg treatment plant, an indoor facility comprising 27 multilayer filter units with an overall filter surface of approx. 3000 m², removes all turbidity and virtually eliminates microbiological contamination in the water processed. The high-speed filter beds contain a 40 cm layer of EVERZIT® N and a 60 cm layer of quartz sand. The coarse-grained EVERZIT®N layer ensures high filtration efficiency. Extended operation cycles of the filter media are realized by volume filtration which also reduces water and energy costs associated with backwashing. The EVERZIT® N multilayer filters are cleaned by sequential air blowing and water flushing.

Advantages of EVERZIT® N

Used as the upper layer in these multilayer filter beds, EVERZIT® N increases treatment capacity and reduces operating costs by providing specific benefits:

  • Increased solids filtration capacity
  • Higher flow speeds through filter bed
  • Reduced pressure drop
  • Longer operation cycle of filter media
  • Reduced backwash-related downtime and costs


Technical Data

Capacity: approx. 15.000 m³/h
Number of multi-layer filters: 27
Total filter surface: 3000 m²
Filtration velocity approx. 5 m/h

Filter layout

Filter materialHeightGrain size
EVERZIT® N:400 mm0.8 - 1.6 mm
Quarz sand:600 mm0.3 - 0.7 mm
Support layer:400 mm-