Abstract: The tube diffuser of which the diameter was 25 mm was manufactured from an advanced PVC material, which incorporated 20 000 microscopic perforations in one meter tube. The perforationsuwere designed with the narrowest point at the external surface. The perforations facilitated the production of ultrafine bubbles of between 0.25mm～1.0mm. These small bubbles gave higher oxygen transfer rates. It can be used in waste water treatment and aquaculture.