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Point Four Microbubble Oxygen Diffuser (MBD)

A ceramic plate diffuser built for dissolving pure oxygen or carbon dioxide in aquaculture systems, in commercial use since 1988. The ultra-fine pore plate produces bubbles of roughly 100 to 500 microns and achieves gas absorption in excess of 80%, so less of the oxygen you pay for is lost. Six models cover 0.75 to 12 LPM, and the modular design lets you run several diffusers from one regulated supply as biomass changes.

Price range: $130.00 through $500.00 ex GST

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Point Four Microbubble Oxygen Diffuser (MBD)
Point Four Microbubble Oxygen Diffuser (MBD) - Image 2

Product Information

Key Features

  • Ultra-fine pore ceramic plate produces a dense cloud of bubbles roughly 100–500 microns across
  • Gas absorption in excess of 80%, depending on depth and flow rate — it cuts the cost of bottled or generated oxygen
  • Flat plate design keeps bubbling uniform across the whole surface and limits bubble coalescence
  • Six models from the compact PMBD75 at 0.75 LPM up to the 1.3 metre MBD1200 at 12 LPM
  • Rigid aluminium base with solid brass fittings on the MBD series; the PMBD75 uses a weighted plastic base
  • Modular — run several diffusers from one regulated supply through a distribution manifold with a flowmeter on each line
  • Suits pure oxygen supplementation and CO2 dosing at a bubbling pressure of 25–35 psi (1.7–2.4 bar)
  • Sizing — divide the gas flow your tank needs by the recommended per-diffuser flow rate in the table below to get the number of diffusers.

Specifications

ModelOverall sizeRecommended gas flowMax flow at 3.5 barWeightGas connection
PMBD75220 × 70 mmup to 0.75 LPM2.2 LPM0.45 kg6 mm (1/4″) hose barb
MBD100370 × 45 mmup to 1.5 LPM4.5 LPM0.54 kg6 mm (1/4″) hose barb
MBD300390 × 83 mmup to 3 LPM9 LPM1.3 kg1/4″ NPT female
MBD600700 × 83 mmup to 6 LPM18 LPM2.3 kg1/4″ NPT female
MBD9001020 × 83 mmup to 9 LPM27 LPM3.3 kg1/4″ NPT female
MBD12001320 × 83 mmup to 12 LPM36 LPM4.3 kg1/4″ NPT female

Downloads

Spec Sheet

Frequently Asked Questions

How do I choose the right MBD size?
Divide the gas flow your tank needs by the recommended per-diffuser flow — 0.75, 1.5, 3, 6, 9 or 12 LPM — to get the number of diffusers.
What oxygen flow does each model take?
Recommended flows run from 0.75 LPM on the PMBD75 up to 12 LPM on the MBD1200, with maximum flows around three times that at 3.5 bar.
What supply pressure do they need?
Run each diffuser at a bubbling pressure of 25–35 psi (1.7–2.4 bar) from a regulated supply.
How efficient are they?
Gas absorption is in excess of 80%, depending on water depth and gas flow rate.
What are they made from?
An ultra-fine pore ceramic plate set in a rigid aluminium base with solid brass fittings; the PMBD75 uses a weighted plastic base.
What gas connection do they use?
PMBD75 and MBD100 use a 6 mm (1/4″) hose barb; MBD300 and larger use a 1/4″ NPT female thread.
How do I maintain them?
The ceramic plate needs periodic cleaning to keep bubbling consistent, and the plate-in-base build is straightforward to service or replate.

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