The two numbers that matter
Everything on this site comes back to the same two numbers: gas purity and delivered dose. For hydrogen water, dose is dissolved concentration in ppm. For inhalation, dose is a function of two separate figures — gas purity and flow rate — and both have to be known for the number to mean anything.
Concentration alone doesn't tell you the dose
A machine can advertise a gas purity percentage without telling you how much gas you're actually breathing per minute. Two devices with identical purity can deliver very different amounts of hydrogen over a session if their flow rates differ. Flow rate — measured in ml/min — is what turns a purity figure into an actual dose you receive.
What our inhaler range delivers
Every model in the QY-A series runs on the same PEM electrolysis platform, so purity is constant across the whole range. Flow rate is what scales with the model tier:
| Model | Flow rate | Gas purity |
|---|---|---|
| QY-A900 | 900 ml/min | 99.991% |
| QY-A1200 | 1,200 ml/min | 99.991% |
| QY-A1500 | 1,500 ml/min | 99.991% |
| QY-A1800 | 1,800 ml/min | 99.991% |
| QY-A3000 | 3,000 ml/min | 99.991% |
Because purity doesn't change across the range, flow rate is the number that actually determines how much hydrogen a given model delivers per minute of use. A higher-tier model isn't producing "stronger" or purer gas — it's producing more of the same verified-purity gas, faster.
Flow rate and session length
Flow rate determines how quickly a session delivers a given volume of gas. A higher flow-rate model completes the same gas volume in less time than a lower flow-rate model; a lower flow-rate model takes longer to deliver the same volume. Session length is a personal choice — we don't prescribe a duration or frequency, and you should use whatever session length feels right for you.
Why we don't quote pressure, "reactive gas," or ionization claims
Consistent with the rest of our technical content: figures like chamber pressure, undefined "reactive" byproducts, or ionization claims don't reliably indicate how much hydrogen you're actually inhaling. Purity and flow rate do. We publish those two numbers because they're independently verifiable and because they're the two that actually determine dose. For the wider context, see our guide on hydrogen water vs the alkaline & "radical" water myths.
Frequently asked questions
What determines hydrogen inhalation dose?
Dose is determined by two figures together: gas purity (the percentage of delivered gas that is actually molecular hydrogen) and flow rate (measured in ml/min). Purity alone does not indicate how much hydrogen is actually being inhaled.
Does a higher flow rate mean stronger or purer hydrogen gas?
No. Across the QY-A inhaler range, gas purity is constant at 99.991% regardless of model. A higher flow-rate model delivers more of the same verified-purity gas per minute; it does not change the purity itself.
What are the flow rates across the QY-A inhaler range?
The QY-A range includes five flow-rate tiers: QY-A900 at 900 ml/min, QY-A1200 at 1,200 ml/min, QY-A1500 at 1,500 ml/min, QY-A1800 at 1,800 ml/min, and QY-A3000 at 3,000 ml/min. All tiers deliver 99.991% verified gas purity.
How does flow rate affect session length?
A higher flow-rate model completes a given gas volume in less time than a lower flow-rate model. Session length itself is a personal choice; there is no prescribed duration or frequency.
Why don't you quote pressure or "reactive gas" figures?
Figures such as chamber pressure, undefined reactive gas byproducts, or ionization claims do not reliably indicate how much hydrogen is actually being inhaled. Purity and flow rate are the two figures that are independently verifiable and that actually determine dose.
Related reading
This article is for general educational purposes. It does not constitute medical advice, and no claims are made regarding the diagnosis, treatment, or cure of any medical condition. Hydrogen Machines products are general wellness devices.