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Membrane Disc Diffuser

Fine bubble EPDM rubber membrane disc diffuser for aquaculture and wastewater treatment. Precision-punched holes produce a consistent 1-3 mm bubble for efficient oxygen transfer in fresh or salt water. Available as the 250 mm KAD250 and 320 mm KAD320, both with a standard 20 mm BSP connection.

Price range: $30.00 through $40.00 ex GST

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Membrane Disc Diffuser
Membrane Disc Diffuser - Image 2
Membrane Disc Diffuser - Image 3

Product Information

Key Features

  • Fine bubble rubber membrane disc diffuser for aquaculture systems and wastewater treatment
  • Precision-engineered membrane holes produce a consistent 1–3 mm bubble, increasing the surface area available for oxygen transfer
  • High-grade EPDM construction resists wear, tear and environmental stress in fresh or salt water
  • Standard 20 mm BSP connection suits a wide range of aquaculture and wastewater manifolds
  • Two sizes — KAD250 at 250 mm and KAD320 at 320 mm diameter
  • Air flow from 25 to 250 LPM per disc depending on model, with a stated optimal rate for each
  • Sizing — divide your total air flow by the optimal per-diffuser flow rate below (70 LPM for the KAD250, 150 LPM for the KAD320) to get the number of diffusers required.

Specifications

ModelSKUDisc diameterAir flow rangeOptimal air flowBubble sizeConnectionMembrane material
KAD250KAD250250 mm25–140 LPM70 LPM1–3 mm20 mm BSPEPDM rubber
KAD320KAD320320 mm50–250 LPM150 LPM1–3 mm20 mm BSPEPDM rubber

Downloads

Membrane Disc Diffuser Spec SheetMembrane Disc Diffusers Brochure

Frequently Asked Questions

How many diffusers do I need?
Divide your total air flow in LPM by the optimal per-diffuser rate – 70 LPM for the KAD250 or 150 LPM for the KAD320 – and round up.
What pressure is required to run it?
It is a low-pressure diffuser fed by a blower, so the supply needs to overcome the water depth above the disc plus the membrane’s own resistance.
Does it suit pure oxygen or air service?
It is rated in air flow for blower-fed aeration duty; for pure oxygen use a fine-pore ceramic diffuser instead, which makes far smaller bubbles.
How does a membrane disc compare with a ceramic diffuser?
Membrane discs move much more gas per unit at low pressure but make 1 to 3 mm bubbles, while ceramic diffusers make 100 to 400 micron bubbles for much higher transfer efficiency.
How do I clean it?
EPDM membranes foul with calcium scale and biofilm over time – hose off the surface, and soak in a dilute acid bath if scale has hardened, then rinse before refitting.
Can it be used in salt water?
Yes – the high-grade EPDM membrane is suited to both fresh and salt water.
What size connection does it use?
Both models use a standard 20 mm BSP connection.

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