ELASTOX®-T disk air diffuserFor optimum aeration

The ELASTOX ®-T disk air diffuser was developed in 1984 for micro-bubble compressed air aeration.

Typical applications are:

  • Preservation aeration of waste water, e.g. in balancing tanks
  • Oxygenation of activation basins  for the purpose of nitrification
  • Oxygenation to stabilize sludge
  • Aeration of rivers and lakes
  • CO2 admission for neutralization

The ELASTOX®-T disk air diffusers with their upturned disk membranes ensure equally distributed aeration without coalescence. An essential feature is the patented central lift limitation that prevents the mem¬brane from swelling like a balloon and thus ensures uniform aeration across the entire air diffuser surface.

Further advantages of ELASTOX®-T include:

  • Excellent oxygen utilization with less pressure loss due to optimized perforation of the membranes
  • Patented lift limitation with integrated spring-loaded check valve
  • High quality membranes with a long service lives thanks to their molded production
  • Also ideal for retrofitting existing facilities because area aeration can be performed regardless of the shape of the basin

Operational principle In the idle state, the membrane lies securely on the flat supporting disk. Only after the internal air pressure rises above the static pressure of the surrounding water will the membrane be lifted slightly from the supporting body and allow the air to expand into the resulting space. The air flows through the perforation of the membrane and enters the liquid as very fine bubbles.

Intermittent mode of operation The structural design prevents liquid from flowing back into the air diffuser when the pressure drops:

  • Due to restoration elasticity, the perforation holes in the membrane close and lay flat on the supporting disk at the same time.
  • The patented lift limitation device located in the middle operates just like a check valve by closing the air inlet openings.


  • ELASTOX ®-T Standard
    Patented central lift limitation integrated into the membrane that also prevents backflow at the same time.
  • ELASTOX ®-T Special
    Patented central lift limitation integrated into the membrane by vulcanization and simultaneously designed as a spring-loaded check valve.

All materials were selected so that excellent resistance to the chemical and biochemical influences expected to be found in biological waste water treatment is achieved. The membrane material is especially important for its resistance to ageing.

EPDM EPDM membrane with extremely low plasticizer content.

EPDM-MB Microbe-resistant version of the EPDM membrane; reduces susceptibility biological sedimentation using a special interlaced additive.

Plasticizer-free silicone membrane with very good resistance to chemicals and anti-adhesive surface properties.

Perforation The membranes can be punched with one of three different types of perforations, enabling the corresponding adjustment to the required air throughput or oxygen content. The distance of pores from each other is precisely defined and prevents the air bubbles from coalescing while they are being produced.


No effect on the overall system even when the membrane is damaged