Key takeaways

• Water makes up over 98% of a cup of filter espresso.
• Its mineral content material acts like salt in cooking, amplifying flavour and depth.
• Baristas and rivals use customized water profiles to regulate acidity, sweetness, physique, and readability.
• Pre-made concentrates are gaining popularity in competitions and high-end espresso retailers.

Water is the invisible basis of pour over espresso. As soon as neglected, baristas now can’t overstate how essential its position in extraction really is.

“It awakens, carries, and elevates each nuance in espresso,” says Jordan Tachnakian, the 2024 World Cezve/Ibrik Champion and the pinnacle of high quality at Terres de Café, the French Nationwide Winner on the International Espresso Awards. “Simply as every espresso calls for its personal exact roast curve, it additionally deserves water crafted with intention.”

Comprising greater than 98% of a cup of filter espresso, water does rather more than simply extract soluble compounds; it actively impacts flavour and mouthfeel. “Even small changes to its mineral content material can noticeably change silkiness vs. crispness, weight on the palate, or the size of the end on the tongue,” Jordan says.

Competitions, high-end cafés, and trade specialists like Maxwell Colonna Dashwood and Christopher Hendon have helped carry water chemistry to the forefront of specialty espresso. Consequently, we’re seeing extra baristas and rivals use customized water profiles with exact mineral concentrations to reinforce sweetness, intensify physique, spherical out acidity, and tweak flavour profiles.

You might also like our article on how cafés filter water for espresso.

How water mineral content material impacts espresso

Grind dimension, water temperature, and agitation are, in fact, important parameters in pour over brewing. However the current laser concentrate on water chemistry is a transparent signal that science is taking part in a much bigger position within the pursuit of espresso excellence.

Whether or not faucet, bottled, distilled, filtered, or spring, water varies around the globe – containing completely different concentrations of minerals, together with magnesium, calcium, and carbonates. The mixture of those soluble minerals inevitably influences how espresso is extracted and tastes.

For a few years, baristas largely centered on water hardness, which may be damaged down into complete hardness and carbonate hardness. The primary is a measurement of the calcium and magnesium ranges within the water, and balanced ranges of each are important for optimum extraction.

Carbonate hardness, in the meantime, is a measurement of what number of carbonates and bicarbonates are current in water. These compounds additionally play a key position in extraction, as bicarbonates act as buffers to keep up pH, ideally between 6 and eight for espresso.

Optimising water hardness continues to be important to extract nice pour over espresso. However baristas at the moment are recognising {that a} wider vary of minerals impacts espresso extraction and flavour. Potassium, for instance, can delay sweeter flavours within the aftertaste, whereas chloride can create roundness and steadiness. Average ranges of sodium can amplify flavours and scale back bitterness, and sulphate can improve floral and citrus flavours.

Successfully, baristas perceive that water’s mineral content material can be utilized like salt when cooking: controlling how a lot you add to amplify the flavours already current and create extra depth and complexity.

A brand new wave of water merchandise for espresso

In response to water changing into its personal brewing variable, extra merchandise are launching that permit baristas to finetune water “recipes”. By including or eradicating completely different concentrations of compounds and ions, they will create customised mineral compositions to realize particular flavour targets.

Naturally, this pattern is most evident at competitions. On the 2024 World Brewers Cup (WBrC), over 70% of rivals used pre-made concentrates – Apax Lab particularly – of their routines. The winner, Martin Wölfl, blended the model’s Tonik, Jamm, and Lylac mineral concentrates to create a candy, spherical, and balanced flavour profile for his anaerobic pure processed espresso.

Espresso retailers are additionally becoming a member of the pattern. “We labored carefully with Simon from Apax Lab to develop our personal mineral equipment,” Jordan explains. “It was designed to enrich each our roasting fashion and completely different water profiles.”

This creates extra alternatives for interactive experiences with prospects – permitting them to style the espresso earlier than and after including mineral concentrates.

“When you cut up your brewed espresso into two cups, add a single drop of minerals to at least one and go away the opposite untouched, you’ll style the distinction – in flavour, texture, and total expression,” Jordan asserts.

Third Wave Water is one other common product amongst skilled and residential baristas. After securing funding on Shark Tank in 2017 and buying competitor Good Espresso Water in 2025, the model expanded its vary to incorporate completely different roast profiles, espresso, chilly brew, and low-acidity flavour profiles.

“One of the vital necessary variations in mineral content material between mild and darkish roasts is alkalinity,” says Charles Nick, the founding father of Third Wave Water. “Typically talking, and that is key, you need extra alkaline water for darkish roasted espresso to easy out flavours and improve the nutty, chocolate notes.”

Precision as normal

Water chemistry has rapidly transitioned from a background variable right into a deliberate software for reaching espresso excellence. Baristas are additionally selecting to optimise mineral content material earlier than and after extraction, opening new avenues for experimenting with sensory profiles.

“It’s an thrilling time in specialty espresso,” Charles says, as he notes that extra cafés are bypassing conventional filtration techniques in favour of totally remineralised reverse osmosis techniques. These techniques take away as much as 97% of mineral content material – successfully making a “clean canvas” for baristas to construct customized water profiles.

Creating DIY water recipes provides flexibility, but in addition comes with challenges. With out the precise experience and steerage, baristas can battle to realize the optimum steadiness of compounds and ions, doubtlessly muting or distorting espresso flavour earlier than extraction even begins.

However accessibility continues to be necessary

The slurry of recent, pre-prepared merchandise then provides a extra accessible entry level into the complicated world of water chemistry. Pre-weighed sachets can take away guesswork, whereas bottled concentrates comprise particular mineral blends to hit exact sensory targets.

“These merchandise are like a gateway into specialty water for espresso,” Charles explains. “Begin with ‘empty’ water, then add a sachet and brew. You don’t have to be a scientist, simply belief that the science has already been taken care of.”

Water’s shift from passive variable to energetic software could also be probably the most vital developments in pour over brewing of the previous few years.

“Water is key to actually having fun with a terrific cup of espresso,” Jordan says. “Even the best espresso on the earth can style disappointing when brewed with laborious faucet water, so it deserves actual consideration.”

To many, accounting for water chemistry amongst quite a few different variables can really feel intimidating and overwhelming, however new merchandise are making it extra accessible.

“There’s no have to overcomplicate issues,” Jordan concludes. “A well-designed filtration system, mixed with considerate mineral adjustment tailor-made to the espresso, already makes a major distinction.”

Loved this? Then learn our article on maximising water high quality and consistency.

Photograph credit: Terres de Café, Third Wave Water

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