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Wilo-Sevio ELASTOX-D 12 | Wilo
Your advantages
Wilo-Sevio ELASTOX-D12

Your advantages

  • Increased operational reliability thanks to spring-loaded hoist restriction of the plate diffuser to evenly expand the membrane for ideal air intake. Thanks to its special design, the air intake is sealed when the membrane is not loaded to prevent fluid penetrating the pipeline system
  • Ideal adaptation of the air intake thanks to three different perforation patterns
  • Greatest possible process-specific activation density by taking different basin geometries and installation conditions into account
  • High flexibility in the system control through very wide control range of the air intake
  • High quality and service life of the membranes thanks to the production of moulded products

Recommended services

Series description
Wilo-Sevio ELASTOX-D 12 (Typ A/C)


Aeration system consisting of disc diffuser and pipeline system to distribute compressed air. On-site downspout or air intake pipe can be connected directly to pipeline system.


For fine bubble aeration of various fluids such as wastewater and sewage or sludge, for the purpose of supplying oxygen and mixing.


Compressed air generators input air into the pipeline system via the air intake pipe. The pipeline system evenly distributes the supplied air to individual diffusers. Air is evenly input to the fluid free from coalescence via a sewage-resistant membrane.



Technical data

  • Nominal diameter 320 mm
  • Perforation area 650 cm2
  • Max. weight 0.95 kg
  • Air load, min.
    • 1.2 Nm³/h (Type B)
    • 1.5 Nm³/h (Type C)
  • Air load, nominal
    • 6.0 Nm³/h (Type B)
    • 10 Nm³/h (Type C)
  • Air load, max.
    • 8.0 Nm³/h (Type B)
    • 12 Nm³/h (Type C)
  • Air load, max. (for short periods)
    • 12 Nm³/h (Type B)
    • 16 Nm³/h (Type C)
  • Air intake min. temperature 5 °C
  • Air intake max. temperature 80 °C (optionally up to 120 °C)
  • Min. fluid temperature 5 °C
  • Max. fluid temperature 35 °C



  • EPDM, microbe-resistant EPDM or silicone

Membrane attachment

  • VA

Support element

  • PP

Pipe system

  • Square pipe: Stainless steel
  • Round pipe: Stainless steel or plastic
  • Fixation: Stainless steel and plastic
  • Gasket: Flat gasket made of NBR


The aeration system is composed of one or more aeration fields. An aeration field consists of several components.

The disc diffuser consists of a supporting plate featuring threaded connection, a plate membrane with hoist restriction and a fastening clip. Thanks to the spring-loaded hoist restriction the membrane expands evenly, thus guaranteeing ideal air intake.

When the membrane is not loaded, the special design makes sure the air intake is sealed. This prevents fluids entering the pipeline system. As a result of the membrane’s excellent resilience, its perforation remains sealed when the membrane is not loaded.

As standard, disc diffusers are installed on the pipeline system using a threaded nipple on the square pipe or a saddle clamp on the round pipe.

The energy-efficient pipeline system guarantees ideal air distribution with low levels of pressure loss. It is detachable, height-adjustable and adapted to the characteristics of the basin and other plant technology.

Scope of delivery

  • Downspout connection
  • Main distribution line
  • Diffuser line
  • End distribution line
  • Drainage pipe connection
  • Membrane diffuser
  • Fastening for pipe system
  • Overview and layout


  • Dosing facility for cleaning and regenerating diffusers by dosing air volume flow with appropriate chemicals. Consists of:
    • Dosing tank
    • Dosing pump
    • Connection accessories
    • Trolley for mobile version option
  • Test lance for checking diffusers during operation. Detachable design for configuration with at least two diffusers. Designed to enable extraction from the basin without reducing the water level or interrupting operation. Consists of:
    • Lifting device made of stainless steel
    • Rope winch in weather-resistant version
    • Wire rope made of stainless steel
    • Required guidance devices made of stainless steel, complete fixing equipment
  • Downspout
  • Drainage pipe
  • Temperature resistance up to 120 °C
    • Disc diffuser
    • O-ring made of FKM
    • Flat gasket made of EPDM
  • Additional monitoring systems on request


Carry out the following prior to commissioning:

  • Basic cleaning of the basin
  • Flushing the pipe system to remove dirt
  • Test impermeability and aeration pattern by applying thin cover of clean, clear water (clear water test)

Thorough cleaning

Numerous contaminants may accumulate in the basin during installation. These contaminants can adversely affect the air intake or damage the diffusers. Therefore, clean the entire basin with clear water and remove any contaminants. Coarse contaminants and debris are to be disposed of by hand. No water jet should impact directly against the membrane, as this can result in damage.

Clear water test

Conducting a clear water test ensures that all of the components are sealed tight and that the aeration fields are working properly.

A basin footbridge is required for correct testing. Potential damage, leakage or uneven aeration patterns cannot be identified to an adequate extent from the outside.

  • Absolutely necessary:
    • This test must be performed with clear, clean water
    • During the test, personnel must inspect the aeration fields from within the basin by walking to each aeration field

  • Not permitted:
    • Mere visual inspection from outside the basin
    • Mere visual inspection inside the basin from the corners or margins

Installation and operating instructions

Wilo-Sevio ELASTOX-D 12

Edition 2018-11
Number of pages 23
Language en
PDF (2 MB)


Biological treatment with efficiency.

Number of pages 20
Language en
PDF (12 MB)


Product overview Wilo-Sevio ELASTOX - 01/2021 - 50 Hz

Number of pages 4
Language en
PDF (959 KB)