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.

Membrane Disc Diffuser

Q: 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.

Q: 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.

Q: 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.

Q: 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.

Q: Can it be used in salt water?

Yes – the high-grade EPDM membrane is suited to both fresh and salt water.

Q: What size connection does it use?

Both models use a standard 20 mm BSP connection.

Fine bubble rubber membrane diffusers for aeration in aquaculture ponds, tanks and wastewater treatment, in fresh or salt water.

Price range: $30.00 through $40.00 ex GST

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Categories: Aeration, Airstones / Diffusers

Applications: Pond, RAS, Water & Wastewater Treatment

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

Model	SKU	Disc diameter	Air flow range	Optimal air flow	Bubble size	Connection	Membrane material
KAD250	KAD250	250 mm	25–140 LPM	70 LPM	1–3 mm	20 mm BSP	EPDM rubber
KAD320	KAD320	320 mm	50–250 LPM	150 LPM	1–3 mm	20 mm BSP	EPDM rubber

Downloads

Membrane Disc Diffuser Spec Sheet Membrane Disc Diffusers Brochure

Frequently Asked Questions

How many diffusers do I need?

What pressure is required to run it?

Does it suit pure oxygen or air service?

How does a membrane disc compare with a ceramic diffuser?

How do I clean it?

Can it be used in salt water?

What size connection does it use?

Spare Parts & Consumables

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Membrane Disc Diffuser

Product Information

Key Features

Specifications

Downloads

Frequently Asked Questions

Spare Parts & Consumables

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