HYDROGENYX Flask vs Susosu Premium — Technical Comparison 2026

— TECHNICAL COMPARISON · MAY 2026 —

HYDROGENYX Flask vs Susosu Premium: the French bottle vs the Korean benchmark.

Susosu Water is the premium Korean brand that popularized hydrogenated water in Japan and Southeast Asia in the 2010s. Present in Europe since 2022 via specialized resellers, its "Susosu Premium" range (~€250) is regularly cited by French-speaking users who hesitate between it and the HYDROGENYX Flask (€239, instead of €299).

This comparison dissects the 6 measurable technical criteria: H₂ concentration controlled by DPD per batch, quality of the SPE/PEM cell, real warranty, manufacturing, price, and total cost of ownership. Sources: official Susosu website, European distributor's technical sheet, user feedback on Reddit r/hydrogenwater and specialized forums.

We are not attacking Susosu. It is a serious brand. We explain what justifies the price and positioning difference.

Full comparison table

1. H₂ concentration: 9,000 PPB (manufacturer data) vs 8,000 PPB advertised

Susosu Premium advertises 8,000 PPB on its official technical sheet (1,600 ppb according to the old ppm unit, multiplied by density). The brand claims laboratory measurements at Seoul Institute of Industrial Technology.

Several user feedbacks mention a discrepancy between the advertised value and the concentration actually delivered in the glass. Why this lab/actual discrepancy? The Nafion 212 (50 μm) membrane used by Susosu is thinner, so it enriches faster but also allows H₂ to leak faster during the bottle→mouth transport. HYDROGENYX uses Nafion 117 (178 μm), 3.5× thicker, which retains dissolved gas longer.

Our commitment: 9,000 PPB (manufacturer data), with DPD reagent control per batch (filmed measurement) before sale. Details in our complete DPD protocol guide.

Key takeaway: HYDROGENYX's thicker membrane limits H₂ loss between the bottle and the glass. This is not marketing; it is membrane physical chemistry.

2. Manufacturing quality: Solid Pt-Ir vs Pt coated Seoul

Susosu uses a platinum-coated electrode (Pt deposit on titanium). Approximate cost: €18-25/cell depending on the supplier. This is a decent technology but shows degradation at acidic pH (lemon water, vinegar) between 800 and 1,500 usage cycles.

HYDROGENYX uses solid platinum-iridium (Pt-Ir, no coating, electrode in the mass) from a specialized supplier. Cost: ~€74/cell. Tested at pH < 6.5 up to 5,000+ cycles without measurable degradation. Our technical article Pt-Ir vs Ti-Pt: why we chose the more expensive option documents the decision.

The HYDROGENYX Flask reservoir is BPA-free, with medical-grade soft silicone in contact with the water. Susosu Premium is made of Tritan plastic with a 304 stainless steel base. Tritan is BPA-free but remains a polymer in contact with enriched water.

Manufacturing side: French brand, whose production is entrusted to a specialized industrial partner and is subject to a numbered series, vs unnumbered serial production in Seoul.

3. After-sales service: 5 years (French brand) vs 2 years return to Korea

Warranty is one of the most visible differences between the two brands.

HYDROGENYX: 5-year cell warranty, free replacement without external expertise, free return. Measured after-sales rate: 1.6% (3 cells replaced out of 184 units in H1 2026, documented in our semi-annual after-sales report). Our engineer answers technical questions within 4 hours in French.

Susosu Premium: 2-year cell warranty, return at user's expense to Korea (estimated €40-60 for shipping + possible customs duties). European distributor email support, 48-72h response in English. After-sales rate not publicly documented.

Over 5 years of use at 3 cycles/day (5,475 cycles), the question is: who honors their warranty without debate? Our cell n°142 replaced for free is a concrete example.

4. Price and Total Cost of Ownership (TCO)

At €239 (instead of €299), HYDROGENYX Flask is at the level of Susosu Premium (€249-€279). But the 5-year TCO differs.

• HYDROGENYX Flask: €239 (instead of €299) + 0 replacement (5-year warranty) = €239 total. This is €0.13 per cycle (over 1,825 cycles = 365 days × 5 years).
• Susosu Premium: €249 + 1 cell replaced out of warranty after 30 months (~€80) + €40 after-sales return fee = €369 total. This is €0.20 per cycle.

At €239 (instead of €299), HYDROGENYX Flask is now at - or even below - the price of Susosu Premium (€249-€279), while offering a higher advertised concentration, a 5-year warranty, and DPD control per batch. Not to mention the time saved on after-sales service.

5. For whom each brand?

Susosu Premium is relevant if:

• You want the historical Korean brand and accept the risk of remote after-sales service
• Your budget is capped at €250 and you accept a real concentration of ~6,500 PPB
• You read English (manual and app)
• You don't need to measure (DPD kit not provided)

HYDROGENYX Flask is relevant if:

• You want 9,000 PPB (manufacturer data) with DPD control per batch, not just a marketing statement
• You want a 5-year warranty honored without external expertise
• You value a traceable French brand (numbered series, after-sales service in France)
• You want to be able to measure yourself with DPD (kit available online, ~€20)
• You want to speak to an engineer in French, within 4 hours

Synthetic verdict

Susosu Premium is a good bottle. It popularized H₂ in Asia. Its technology is decent, and its ergonomics too. But for a now comparable price, HYDROGENYX Flask offers a higher advertised concentration, a more expensive cell that lasts longer, and a warranty honored at no cost.

The choice depends on your risk tolerance: after-sales service in Korea and a historical brand, or a French brand with a 60-day satisfaction guarantee to verify with DPD at home.

6 Technical criteria compared · ±5% HYX DPD Tolerance · 5 years Cell Warranty

“Susosu is a serious brand. We are not comparing to criticize—we are comparing to explain why our 5-year warranty and DPD control make a difference.”
Paul Fournier · Founder of HYDROGENYX · French Brand

Test HYDROGENYX Flask — 60-day money-back guarantee

If you hesitate between Susosu Premium and HYDROGENYX Flask, here is our commitment: 60 days to test in your daily routine. A DPD kit is available online (~€20) to verify the advertised 9,000 PPB. If you are not satisfied with the use, full return and refund, no questions asked.

€239 (instead of €299) · 9,000 PPB (manufacturer data) · DPD control per batch · 5-year cell warranty · French brand.

Discover HYDROGENYX Flask →

Customer reviews · hundreds of scientific publications on H₂ cited

Factual comparative article — May 2026. Competitor data comes from public sources: official websites, available technical sheets, user tests shared on Reddit r/hydrogenwater and specialized forums, Amazon buyer reviews. If you measure your bottle with DPD, send us your results — we will update this comparison. HYDROGENYX is not affiliated with the mentioned brands. Molecular hydrogen is studied for its antioxidant properties and does not substitute any medical treatment.

The HYDROGENYX Flask is a water preparation device, not a medical device. It does not prevent, treat, or cure any disease.