FREO2
FREO2 offers Siphon, an electricity-free oxygen concentrator which is durable, affordable and has no ongoing costs. The system harnesses energy from a small amount of running water to separate oxygen from the surrounding air.
Rankings by 
Национальный рейтинг
23rd
in AustraliaРегиональный рейтинг
24th
in Australia and OceaniaГлобальный рейтинг
1648th
worldwide