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Point Four Diffusers

Simple and Cost Effective Way of Dissolving Gases in Water

One of the simplest ways to dissolve gases, such as oxygen or carbon dioxide, in water is to introduce the gas as small bubbles. The smaller the bubbles, the more efficient will be the absorption of the gas.

The Point Four microbubble oxygen diffusers (available in 4 sizes) produce a cloud of extremely fine bubbles, 100 to 500 microns, much finer than graphite diffusers or porous hose. Bubbles do not coalesce because Point Four diffusers are flat.

The Point Four diffuser employs an ultra fine pore ceramic plate producing uniform bubbles across its entire surface. Ceramic is a clean, inert material.


bubbling pressure
25 to 35 psi. (1.7 to 2.4 bar)
absorption efficiency
largely depends on submerged depth (or operating pressure), typically 40% to 50% at 1m depth; can be as high as 80% or even 100% at depths of 6m or more (also depends on flow rate).
model MBD 600 MBD 300 MBD 100 MBD 75
diffusing area 24" x 2 3/8" (62 cm x 6 cm) 12" x 2 3/8" (31 cm x 6 cm) 12" x 1 1/8" (31 cm x 3 cm) 6 1/8" x 1 1/8" (15.5 cm x 3 cm)
overall size 27" x 3" (70 cm x 8.3 cm) 15" x 3" (39 cm x 8.3 cm) 14" x 1" (37 cm x 4.5 cm) 8" x 1" (22 cm x 4.5 cm)
weight 5 lbs (2.3 kg) 2.7 lbs (1.2 kg) 1.2 lbs (540 g) 0.7 lbs (320 g)
recommended operating range up to 6 LPM (12.7 SCFH) up to 3 LPM (6.4 SCFH) up to 1.5 LPM (3.2 SCFH) up to 0.75 LPM (1.6 SCFH)
maximum flow rate @ 50 psi (3.5 bar) 18 LPM (38 SCFH) 9 LPM (19 SCFH) 4.5 LPM (9.5 SCFH) 2.2 LPM (4.7 SCFH)
gas inlet connection 1/4" NPT Female 1/4" NPT Female 1/4" Hose Barb. 1/4" Hose Barb.
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