GEMDISC Disc Diffuser | 325 mm | EPDM

excl. VAT: €44.25 VAT: €10.18 *
Quantity Unit price
To 9 €54.43 * (€44.25 excl. VAT, VAT: €10.18 * )
From 10 €43.54 * (€35.40 excl. VAT, VAT: €8.14 * )
From 30 €39.91 * (€32.45 excl. VAT, VAT: €7.46 * )
From 100 €36.29 * (€29.50 excl. VAT, VAT: €6.79 * )

Prices incl. VAT plus transport costs

Ready for dispatch! Delivery-time: 1-3 working days (ROI & NI)

  • GDD325-E
  • GDD325-E
  • 1 kg
Aeration Disc Diffuser Membrane Material: EPDM Material Plate & Securing Ring: PP Upper... more
Product information "GEMDISC Disc Diffuser | 325 mm | EPDM"

Aeration Disc Diffuser
Membrane Material: EPDM
Material Plate & Securing Ring: PP
Upper Diameter: 325 mm (300mm aeration)
Lower Diameter: 330 mm
Perforation: 1.0 mm | fully opened: ~ 200 mbar
Connection: ¾“ MT
Q(min): 2 Nm³/h | (Q(max): 12 Nm³/h

Made in Germany


Fine bubble aeration with high oxygen-transfer is essential to obtain treatment level targets. It is recommended to evenly distribute GEMDISC disc diffusers within the aeration chamber (bio-reactor) for well-balanced fine bubble aeration.


The 12" disc diffuser with EPDM membrane ensures long-term reliable operation due to the valve-effect of the perforation, enabling both continuous as well as energy-efficient intermittent aeration intervals.


For effective operation and membrane longevity, air-input volume and pressure introduced into the disc diffuser should be (a) as high as is required for a good air bubble picture and (b) as low as possible.


The perforation of the membrane begins to open at approximately 40 mbar and is fully opened at ~ 200 mbar. After initial start-up (commissioning), it may be required to briefly operate at a moderately higher pressure level in order to allow the perforation over the full cross-section of the disc diffuser to open entirely. 


The flexible and elastic membrane in EPDM is suitable for operation at wastewater treatment plants with predominantly domestic sewage combined with a light to moderate influx of industrial wastewater.


Areas of Application:

  • municipal sewage & wastewater treatment plants
  • decentralised remote sewage treatment systems
  • domestic wastewater treatment systems
  • aeration on landfill sites
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