Alkaline Water Benefits: The Science, the Numbers and the Side Effects

You have checked the TDS sticker on the purifier. You have argued about whether the water tastes sweet or flat. You have never once asked whether the water is doing something to you on the way down — not the minerals, not the number on the bottle, but the invisible chemistry nobody prints on the label. Nearly every page on alkaline water benefits stops at a single measurement and calls the matter settled. There are three numbers that actually describe this water. Two of them are missing from almost everything you have read, and they are the two that matter.

The one number that hides two others

Alkaline water is water with a pH above neutral 7, typically between 8 and 9, containing alkaline minerals such as calcium, magnesium and potassium. The pH scale runs 0 to 14; pure water sits at 7. "Alkaline" simply means the water rests on the basic side of that scale rather than the acidic side. But the real alkaline water benefits depend on two more numbers pH alone never shows.

That is the entire definition, and it is also where most articles quietly stop. pH answers one question — how acidic or basic the water is — and nothing more. It says nothing about whether the water carries antioxidant potential or dissolved hydrogen, which are separate, measurable things. Two routes raise a water's pH. Dissolved minerals make natural spring water alkaline. Or electrolysis, which runs water over charged plates and splits it into an alkaline stream and an acidic one.

The distinction matters more than any single benefit claim. Adding minerals, or a pinch of baking soda, lifts the pH and does nothing else. Electrolysis lifts the pH and adds two properties minerals cannot: a negative ORP and dissolved molecular hydrogen. Ionized alkaline water is the electrolysis product — usually pH 8.5 to 9.5 for drinking — and it is the only version worth measuring properly. Same word on the label. Very different water in the glass.

Three measurable properties, not one

Alkaline ionised water is described by three numbers, not one: pH (how alkaline, usually 8.5 to 9.5); ORP, oxidation-reduction potential in millivolts (a negative value signals reducing, antioxidant potential); and dissolved molecular hydrogen, H2, in parts per billion (typically 500 to 1,600). Almost every article quotes pH alone and stops there.

Here is the part most pages get wrong. Ordinary tap and RO water carry a positive ORP, roughly +150 to +400 mV — an oxidising state, the same chemical direction that rusts an iron gate or browns a cut apple. Ionized alkaline water carries a negative ORP, commonly cited from about −200 mV down to −800 mV. And the actual antioxidant agent is not the alkaline pH at all; it is the dissolved hydrogen gas. One honest caveat that separates a real explanation from a sales pitch: ORP should not be used to estimate or compare hydrogen concentration, because the two do not reliably correlate. If you want to know the hydrogen, you measure the hydrogen.

This is the uncontested ground in the whole category. Any brand can raise pH and print it on a bottle. Very few will hand you an ORP reading in millivolts and a dissolved-hydrogen figure in ppb on fresh water, because those require real electrolysis and they fade in a sealed bottle. SOMAWA is built to be read on all three at once.

What the water actually does — and doesn't

People commonly report easier daily hydration, a smoother taste, and comfort with mild acidity. Some studies have explored acid-reflux and bone markers. Graded honestly: hydration and reflux comfort have early support; "neutralising body acid", anti-aging and weight loss do not. Treat the strong claims as unproven, because they are.

Here is the split, stated plainly. What has some evidence: a 2012 laboratory study found water at pH 8.8 deactivated pepsin, the enzyme involved in acid reflux — a research finding, not a cure. What has none: the idea that a glass of water "cleanses" the body or resets its pH. Your blood is held between 7.35 and 7.45 by your lungs and kidneys no matter what you drink, and stomach acid at roughly pH 1.5 to 3.5 neutralises alkaline water on contact. If someone tells you alkaline water re-balances your body's pH, they are selling a story, not explaining the chemistry.

Side effects, honestly. For most healthy adults they are mild and uncommon. Very alkaline water can occasionally cause nausea, or reduce stomach acidity enough to affect digestion in some people. The specific threshold medical sources flag is water above pH 9.8, which raises the risk of high blood potassium — hyperkalemia — especially in vulnerable groups. That is exactly why the sensible drinking range is 8.5 to 9.5, and why a bigger pH number is not a better one. People with chronic kidney disease, and anyone on heart, blood-pressure or kidney medication, should check with a doctor before making it their main water. Naming who should be careful is not a disclaimer for its own sake. It is the responsible thing to print.

Same word, different water

Bottled alkaline water and mineral water raise pH with minerals and hold it — but by the time you drink them, any dissolved hydrogen has escaped and the ORP has drifted positive. Ioniser water is made fresh at the tap, keeping its negative ORP and hydrogen. Bottled sells pH; the ioniser delivers all three, live.

This is the cleanest line in the category, and almost no page draws it. A bottle can honestly print a pH figure, because pH is stable in storage. It cannot honestly promise a live ORP or hydrogen reading, because both fade the moment the water sits sealed on a shelf. Natural mineral water is a fine, pleasant drink with a mineral profile fixed by its source. But if the negative ORP and the hydrogen are what interest you, only fresh electrolysis produces them — and only freshly.

Freshness is the whole difference, and it is the one advantage a bottle can never redraw.

Making it, and drinking it sensibly

You can raise pH at home with a pinch of baking soda, pH drops, alkaline mineral cartridges or a pitcher — but these change pH only. A negative ORP and dissolved hydrogen need electrolysis, which no kitchen trick replicates. For intake, most healthy adults settle around 1 to 2 litres a day, started gradually.

So the home methods are honest for exactly one job: nudging pH upward for taste or mild acidity. If a method cannot show you an ORP reading in millivolts or a hydrogen figure in ppb, it is moving the pH and nothing else. That is fine — as long as nobody sells it as more. Beginners do best starting gently: one or two glasses of pH 8 to 9 water a day for the first week, then increasing gradually if it suits you. Avoid drinking highly alkaline water right around meals, since it can slightly dilute stomach acid. There is no prize for rushing, and more is not automatically better.

Buying an ioniser in India

Indian alkaline ioniser machines span roughly ₹15,000–₹40,000 for budget units up to ₹1.5 lakh and beyond for higher-plate models. The imported name most people recognise, Kangen, retails around ₹2.18–₹3.97 lakh in 2026. What separates machines is plate material, power electronics and who services them — not the marketing.

Two honest cautions for Indian buyers. First, source water matters: borewell and hard water affect any machine, so a water test before buying is worth more than any brochure figure. Second, judge a machine by what it will show you on a meter and who will repair it in your city years from now — not by the loudest number on the box.

SOMAWA publishes its pricing as a one-time, transparent figure — from the Amara at about ₹1.14 lakh to the flagship Modish and the Toya — rather than quoting it across a table. The price you read is the price you pay.

The three numbers you can watch on a meter

To verify alkaline water is genuine, don't trust a label — measure three things. Check pH (expect 8.5–9.5). Check ORP with a meter (expect a negative millivolt reading). And check dissolved hydrogen, because that, not pH, is the antioxidant agent. SOMAWA is the Indian ioniser built to show you all three, live, in your own kitchen.

This is where the category sorts itself out honestly. Anyone can raise pH. Almost no one prints an ORP in millivolts and a dissolved-hydrogen figure in ppb on fresh water in front of you — because those require real electrolysis, and they fade in a sealed bottle. So the test is simple: ask for all three numbers, measured live, on a calibrated meter. SOMAWA, India's alkaline water ioniser institutionally backed & incubated by NRDC (National Research & Development Corporation), Government of India, Ministry of Science & Technology, is designed to pass exactly that test. Its flagship Modish uses 9 sintered platinum-titanium plates, delivers selectable pH with negative ORP down to about −800 mV and dissolved hydrogen up to roughly 2,000 ppb, and is engineered to a 25-year build standard.

Many of our customers have experienced water that simply feels lighter and easier to drink through the day, and they keep returning to it. We frame that as their experience, not a medical promise — because the measurable facts speak first, and the meter, not the marketing, does the talking. When something is built to be checked, you rarely need to take it on faith. That is the whole point of three numbers instead of one.

Keep reading: What Is ORP in Water?, Molecular Hydrogen Water, and The pH of Everything You Drink. For the engineering, see the science behind your water.