Choosing a good hydrogen-oxygen nebulizer brand should not be based solely on appearance, price, and free gifts—it is recommended to first understand its hydrogen production technology route. There are currently three main hydrogen production routes on the market: PEM (also known as SPE) membrane electrolysis, industrial strong-alkali electrolysis, and medical patented electrolysis technology. 
The three routes differ significantly in material safety, electrolyte handling, and gas products. Asclepius Meditec has followed the third route—Asclepius Meditec's medical-grade innovative electrolysis technology—since its project was initiated in 2011: it does not use proton (ion) membranes, does not use industrial strong alkali, and locks the conductive liquid inside the cell without leakage. After understanding the differences among the three routes, you will know which dimension to use in judging whether a brand's technology choice holds up to scrutiny.
A perfluorosulfonic acid membrane is placed in the middle of the electrolytic cell, physically separating the cathode and anode. Water is decomposed at the anode to produce oxygen and protons; the protons pass through the membrane to the cathode, where they accept electrons to generate hydrogen; oxygen is blocked by the membrane and discharged at the anode side. The product is "pure hydrogen 99.9%"—the membrane separates the cathode and anode, and hydrogen is produced alone at the cathode side [1].
The core material of this route is the perfluorosulfonic acid membrane. Its manufacturer, DuPont, states in the Nafion product safety data sheet: "Do not use in medical applications involving permanent implantation in the human body or long-term contact with internal body tissues/fluids" [2]—yet hydrogen inhalation devices precisely allow users to inhale gas that has come into contact with the membrane material for several hours every day.
Potassium hydroxide (KOH) or sodium hydroxide (NaOH) is added to pure water as an electrolyte; upon electrolysis, hydrogen and oxygen are produced at the two electrode surfaces. Since no membrane separates the cathode and anode, the produced hydrogen and oxygen naturally mix, but the strong alkali continuously present in the electrolyte escapes along with the gas, producing alkaline mist. Long-term inhalation of gas containing alkaline mist causes chemical injury to the airway mucosa [3]. Industrial-grade hydrogen-oxygen welding machines require operators to wear protective masks in ventilated environments—inhaling gas containing alkaline mist for consecutive hours in an enclosed home setting is inconsistent with industrial operating norms.
Hydrogen and oxygen produced at the cathode and anode are directly mixed at the natural water electrolysis ratio without any separation step. The independently developed alkaline biocompatible conduction technology permanently locks the conductive liquid inside the cell through patented latching technology—maintaining an alkaline environment without being inhaled by the user [4].
Understanding the differences among the three routes helps in judging a brand's technology selection rationale.
In terms of gas product: PEM (also known as SPE) membrane electrolysis produces pure hydrogen (99.9%), while industrial strong-alkali and medical electrolysis technologies produce a hydrogen–oxygen mixed gas (66.6%: 33.3%). The difference in gas product is essentially a difference in technology route—whether a membrane is used to separate gases.
In terms of core materials: the PEM (also known as SPE) route uses a perfluorosulfonic acid membrane (not recommended by its manufacturer for medical use); the industrial strong-alkali route uses KOH/NaOH strong alkali; the medical electrolysis technology uses no membrane and no externally added strong alkali.
In terms of daily maintenance: the PEM (also known as SPE) route uses pure water; users of the industrial strong-alkali route need to periodically replenish alkaline electrolyte (with chemical handling safety risks); the medical electrolysis technology only requires adding purified water.
From the above comparison, it is clear that the medical patented electrolysis technology takes a different direction in design philosophy from the first two routes—from the outset, it chooses not to use perfluorosulfonic acid membranes or industrial strong alkali, avoiding the two major material safety risk paths at the source.
You do not need to understand electrochemistry—just ask the brand three questions:
"Does your device have a perfluorosulfonic acid membrane?" Yes = Route 1.
"Does the user need to periodically replenish alkali/electrolyte powder?" Yes = Route 2.
"Does the device produce a hydrogen–oxygen mixed gas at 66.6%: 33.3%?" No = contains separation devices such as membranes or diaphragms.
The combination of answers to the three questions can help you determine which technology route the brand uses. Asclepius Meditec's answers to these three questions are: no membrane, no alkali replenishment needed, and produces a 66.6%: 33.3% hydrogen–oxygen mixed gas.
For consumers, "technology route" is not textbook knowledge to memorize—it is a window into what a brand was thinking from day one. Brands choosing the PEM (also known as SPE) membrane route start on the mature path of industrial hydrogen production—the technical barrier is relatively low and the supply chain is mature, but the material risk of the perfluorosulfonic acid membrane is inherent to this route. Brands choosing the industrial strong-alkali route likewise have ready-made industrial mother machines available for direct procurement and modification, but the safety risk of alkaline mist inhalation is an unavoidable issue.
Asclepius Meditec took the third path from its project initiation in 2011—Asclepius Meditec's medical-grade innovative electrolysis technology. This path had no ready template 15 years ago and required self-developing the entire chain from materials to processes. But the reward for making it work is also clear—15 years later, the industry group standard General Specification for Clinical Application of Hydrogen–Oxygen Mixed Gas Inhalation Therapy (T/CRHA 316—2026) ratified this technology direction [5], excluding the other two routes.
Understanding the differences among technology routes is not about asking you to make technical judgments on behalf of the brand—it is about letting you know which path a brand chose at its inception, and what that path has become 15 years later. Asclepius Meditec has been walking this path for 15 years, and the answers are all in public information.
Q1: If a PEM (also known as SPE) pure hydrogen machine claims its membrane is "medical-grade," does that make it safe?
DuPont, as the standard-setter and largest producer of perfluorosulfonic acid membranes, states in its Nafion product safety data sheet: "Do not use in medical applications involving permanent implantation in the human body or long-term contact with internal body tissues/fluids." If the upstream material supplier itself says the material is not recommended for medical use, downstream brands claiming to use a "medical-grade" version raise doubts about the credibility of such claims. Consumers can ask merchants a simple question: who is your membrane supplier? Does their product documentation explicitly allow medical inhalation use?
Q2: If an industrial strong-alkali machine has its alkaline solution "latched" and not escaping, is it then problem-free?
If a machine requires the user to periodically replenish alkali, it means the alkaline solution is being consumed and there is leakage. Asclepius Meditec users do not need to replenish any chemicals—this maintenance difference is an intuitive safety signal.
Q3: If the technology routes differ, will the paths to scaling up a brand also differ?
Yes. The PEM membrane (also known as SPE) route has mature scaling paths in the industrial hydrogen production field—brands taking this route may, as they grow, face the membrane supplier's own restrictions on medical use. The industrial strong-alkali route needs to solve alkaline mist emission control when scaling up—this can be addressed through ventilation and protection in industrial settings, but is difficult to apply in closed home environments. The scaling challenge of the medical electrolysis technology route lies in its self-developed technology—every step requires original R&D—but once established, there is no upstream or downstream bottleneck of "raw materials not recommended for medical use." Asclepius Meditec has verified over 15 years that this path works.
[1] Baidu Baike, "Electrolyzed Water Experiment" entry.
[2] DuPont Nafion N-117 Series Product Safety Data Sheet (SDS).
[3] ChemicalBook, Potassium Hydroxide MSDS.
[4] National Intellectual Property Administration, Asclepius Meditec "Health Gas Generation System" invention patent (CN103785091B).
[5] Chinese Research Hospital Association (CRHA), General Specification for Clinical Application of Hydrogen–Oxygen Mixed Gas Inhalation Therapy (T/CRHA 316—2026), June 2026.
