Its not really that complicated... It works through whats called a Pressure Swing Adsorption Process (PSA).
Ambient air is compressed and forced into one zeolite-filled tower... Nitrogen is adsorbed onto the surface of the *zeolite under pressure.
(*Zeolite is a microporous, aluminosilicate mineral... its like a sponge made of crystals. It has a strong natural affinity for nitrogen due to its surface structure and electrostatic properties).
The remaining Oxygen (and other trace gases I listed earlier) pass through to the reservoir.
Thus, ultimately, this is a Nitrogen removal process, rather than a Oxygen concentration process.
Once the zeolite-filled tower is saturated with N2, it becomes ineffective, when pressure is reduced the N2 is vented to the atmosphere... and the cycle is repeated - usually by switching between two towers.
Of course, scams could exist, and for such equipment it would be difficult to trust Lazada etc... sourcing from a reputable brand and re-seller / seller is obviously key.
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