H2CAP Plus

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H2 Concentration Test

Measured, not marketed

Hydrogen Water Bottle Test: the actual numbers

Full hydrogen water bottle test data for the H2CAP PLUS — dissolved H₂ across cycles, water types, and time. One figure is third-party; the rest are ours, with the method stated so you can repeat them.

Most product pages give you one big number and no context. A hydrogen water bottle test only means something with the conditions attached — which water, which instrument, and how many seconds after the cycle stopped. All three are below.

1,036ppb · JHPA verified
1,000–1,500ppb · our range
300 hsealed retention
JHPA Registration Card for Product Qualification — Japan Hydrogen Water Promotion Association
JHPA (Japan), October 2018 — Report 218H-221
How we measured this

The method, stated plainly

InstrumentsTrustlex ENH-2000 for ppb; WTW MultiLab Pro 40 IDS for ORP.
FillBottle filled to 90%, one standard 3:30 cycle unless noted.
TimingMeasured immediately after generation — before gas escapes.
RepeatsThree cycles per condition, averaged.

Why spell all this out? Because in a hydrogen water bottle test the method changes the answer more than the device does. Measure five minutes late and a genuine 1,300 ppb reads as 400. Use a peak-hold meter and you capture a spike that no drinker ever experiences. Our figures use dissolved-hydrogen readings taken the way you would actually drink the water — sealed, fresh, averaged.

Dissolved hydrogen retention: four test conditions, y-axis zoomed to 900-1,300 ppb Line chart with a broken time axis and a y-axis zoomed to 900-1,300 ppb to resolve small differences between lid-closed conditions. With the lid closed, purified natural water holds near 1,190 ppb, purified RO water near 1,140 ppb, and purified tap water varies gently between about 1,010 and 1,130 ppb; all three stay above 1,000 ppb through 300 hours. With the lid open, purified RO water declines from about 1,190 ppb and exits the bottom of this zoomed view around 27 hours at about 916 ppb, continuing to fall to 0 ppb by 48 hours as noted by an arrow. FIRST 48 HOURS 48 – 300 HOURS Y-AXIS ZOOMED · 900–1,300 ppb window 900 1,000 1,100 1,200 1,300 1,000 ppb reference continues to 0 ppb by 48 h (off-scale below) axis break 0–900 ppb omitted 0 3 12 24 48 72 96 120 168 240 300Time after generation (hours) Dissolved hydrogen (ppb)still ~1,190 ppb at 300 h Purified natural water — lid closed Purified RO water — lid closed Purified RO water — LID OPEN Purified tap water — lid closed Trustlex ENH-2000 · three cycles per condition, averaged · y-axis windowed to 900–1,300 ppb to resolve the lid-closed band · time axis broken at 48 h.
Dissolved H₂ over 300 hours — sealed vs open, across water types.

The lid is not a detail

Sealed, dissolved hydrogen stays above 1,000 ppb for 300 hours across every water type we tested. Leave the lid open, and the same water falls below measurable H₂ within about 48 hours.

This is physics, not a product flaw: H₂ is the smallest molecule and escapes any open surface. It is also why a peak ppb number means little without a timestamp — the honest question is not "how high" but "how high, measured when."

Practically, it means one habit matters: drink within the first hour, or keep the cap sealed until you do. Nothing about the electrode or the water chemistry changes that — an open glass on a desk simply loses gas to the air, the same way carbonated water goes flat.

Output by water type

Purified / RO
1,000–1,200
ppb · extended cycle
Tap water
1,200–1,400
ppb · standard cycle
Mineral water
1,300–1,500
ppb · standard cycle
Don't take our word for it

Reproduce this hydrogen water bottle test at home

A published number you cannot check is just a nicer-looking claim. So here is how to verify every figure on this page yourself, with equipment that costs less than the device. Run the same hydrogen water bottle test we did, on your own water, and hold our numbers to account.

The whole point of publishing a method is that you can run it. The affordable route is a methylene-blue titration kit: each drop neutralizes roughly 100 ppb of dissolved H₂, so counting drops to a color change gives you a ballpark in under a minute — enough to tell a real 1,200 ppb reading from a 500 ppb one. The precise route is an electrochemical DH meter (Trustlex ENH series), the same instrument class behind our figures and the third-party report.

Two rules decide whether your hydrogen water bottle test means anything: measure within seconds of the cycle finishing, and keep the sample sealed until the probe is in. Compare your reading to the water-type table above using the same source water, and you should land inside our published range. If you do, the numbers were real; if a competitor's device cannot, you have learned something too.

Download the JHPA report (PDF)

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