Distilled Water vs Treated Water Coffee - Can You Tell A Difference?
What this covers
Water minerals, like the ones from Third Wave Coffee, make the claim that better water leads to better coffee. To find if that’s true out we’re conducting a series of tasting tests, comparing pour over coffee made with distilled water versus water treated with Third Wave Water. Two tasters, two sets of coffee beans - can we reliably detect a difference? Let’s find out.
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Source description (no synthesized summary yet).
Water mineralization has a measurable but subtle effect on pour-over coffee taste that is difficult to reliably detect in blind tastings, with detection varying by roast level and individual taster sensitivity.
- Tasters failed to consistently identify mineralized vs. distilled water in triangle tests despite theoretical mechanisms supporting a difference
- Detection difficulty varied by roast profile (lighter roasts showed clearer differences than dark roasts)
- Individual sensory approaches (texture vs. acidity focus) affected detection ability
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Mineral balance in water impacts extraction of coffee solubles, which is especially important in pour-over brewing where water contact time with grounds is relatively short.
“The mineral balance of water impacts extraction of coffee solubles and this is especially important with pour over where the water is in contact with the coffee grounds for a relatively short period of time”
Magnesium sulfate (Epsom salt) increases extraction of acidic compounds from coffee and tends to emphasize fruity and bright flavors.
“we've got magnesium sulfate that's better known as Epsom salt and that can increase extraction of acidic compounds from coffee it tends to emphasize fruity and bright flavors”
Calcium chloride promotes extraction of heavier compounds, and a balanced level of calcium makes coffee taste richer and more full-bodied.
“calcium chloride tends to promote the extraction of heavier compounds a balanced level of calcium can make the coffee taste richer and more full-bodied”
Sodium chloride (table salt) has less to do with extraction and more to do with taste perception, by reducing the perception of bitterness in coffee.
“sodium chloride that's plain old table salt has less to do with extraction and more to do with taste by reducing the perception of bitterness and coffee”
The mineralized water treatment packet contains three specific minerals: magnesium sulfate, calcium citrate, and sodium chloride, chosen to address different aspects of coffee extraction and taste perception.
“it contains magnesium sulfate calcium citrate and sodium chloride or salt”
The theoretical prediction that distilled water would create bland, unpleasant coffee while mineral-treated water would improve taste was not consistently validated by blind taste tests, despite the underlying chemistry supporting the mechanism.
“the theory here is that using Straight Up distilled water is going to create quite a bland unpleasant tasting coffee and by adding some minerals to it we should be able to improve things”
The two tasters used different sensory approaches: the primary taster focused on texture and viscosity differences while Dan focused on acidity and sharpness differences, and this methodological difference affected their detection success.
“for me and this is funny because we take different approaches to it you were looking for acidic versus sharp and I was looking actually more of a texture difference one thing I've noticed is is that certain coffee preparations affect the the viscosity uh the oiliness of it”
For everyday coffee preparation, the practical difference between distilled and mineral-treated water is likely undetectable for most people without focused sensory attention.
“does it really matter if for your day-to-day coffee I mean if you had prepared if I had prepared randomly one day with a distilled and another day with mineral water in your methods would you notice a difference clearly not right”
The primary taster also failed to reliably detect the difference between distilled and mineralized water when tasting the water directly, despite reporting a perceived mouthfeel characteristic.
“I'm going to stick with this that's the distilled and these are the other two distilled oh that's not a good sign”
The primary taster could not reliably detect the difference between distilled water and mineralized water in blind triangle tests, failing 5 out of 5 tests despite theoretical predictions that mineral-treated water should produce noticeably different coffee.
“I got all five wrong which even by chance would be hard to do”
Espresso enthusiasts commonly insist that mineral water is necessary for proper espresso making, but the speaker has never tested whether distilled water produces noticeably inferior espresso.
“for those who are espresso fans a lot of times people insist that you have to have mineral water I've never tried making espresso with distilled water”
The secondary taster (Dan) could distinguish between mineralized and distilled water directly, but struggled to consistently identify the mineralized coffee in the blind tests.
“tough luck Dan but at least he was able to distinguish which water was which a test that I failed at”
With darker roast coffee beans, the primary taster detected a difference between sharp-tasting and flat-tasting coffees but could not reliably identify which was which in blind tests.
“I felt with the darker roast there was a difference between flat and sharp although I was not able to detect it reliably”
With lighter roast coffee beans, the primary taster could not detect any difference between mineralized and distilled water coffee preparations.
“with the more light roast the acidic roast I couldn't tell the difference at all”
The secondary taster (Dan) found the difference more apparent with lighter roast beans, suggesting detection sensitivity is roast-profile dependent.
“with the lighter roast beans the difference seemed more apparent to Dan but sadly not for me”
Higher water acidity from mineral treatment (from magnesium sulfate) may enhance coffee viscosity perception, making texture-focused tasters more likely to detect mineral water effects than those focusing on flavor alone.
“who knows maybe the higher acidity makes that easier to detect I mean this is all supposition at this point”
The dark roast coffee used in initial tests had roast notes that complicated sensory analysis, making it harder to isolate water-based flavor differences.
“uh I don't know if I would have picked this particular coffee for this one because it does have a lot of roast notes on it which doesn't make life easier”
Triangle test methodology (presenting two identical samples and one different sample, requiring the taster to identify the odd one out) is appropriate for detecting subtle differences in coffee taste, with results expected to be statistically significant if differences are reliably perceivable.
“Dan from home Barista and myself are taking five triangle tests two cups contain one coffee perhaps the distilled condition and one cup contains the other coffee perhaps the treated condition where you mix it up each time our job is to pick which is the odd one out”
The primary taster detected a 'cat tongue' mouthfeel effect in the mineralized water when tasting water directly, describing it as a tactile sensation distinguishing the treated from distilled water.
“The difference I was looking for though has as much to do with mouth feel about of all things I always describe this as kind of like a a cat tongue sort of effect right and that's what I was looking for”