Updated on August 2, 2019


Created on August 2, 2019


Upcoming Update

The FREO2 Siphon is an electricity-free oxygen concentrator.

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Product Description

The FREO2 Siphon is an electricity-free oxygen concentrator designed for settings that often experience power outages. It is designed to be durable and uses water to concentrate the oxygen.

Distributors / Implementing Organizations

Manufacturing/Building Method

The FREO2 Siphon is manufactured by the FREO2 Foundation which is based in Melbourne and includes sensors manufactured by Sensirion.

Intellectural Property Type

Open Source

User Provision Model

The FREO2 Siphon is currently in clinical trials and is not yet available for purchase.

Distributions to Date Status


Design Specifications

FREO2 uses a “molecular sieve” to remove nitrogen and leaves mostly oxygen. FREO2 passes a small amount of flowing water through a siphon to produce a vacuum and mechanically converts part of this to compressed air. The vacuum and the compressed air power a vacuum pressure swing absorption system to concentrate oxygen.

Technical Support

The product is currently in clinical field trials. Support for these is provided by the manufacturer.

Replacement Components

This product is a prototype, replacement parts are not yet available.



Manufacturer Specified Performance Parameters

Vetted Performance Status




Complementary Technical Systems


Academic Research and References

Sobott B.A., Peake, D.J., Black, J.F., Rassool, R.P., 2015, FREO2: An Electricity Free Oxygen Concentrator, Pneumonia, pp. 6-115.

Compliance with regulations


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