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empirical water GLACIAL, v1.5 — Concentrate

empirical water GLACIAL, v1.5 — Concentrate

Regular price $40.00
Regular price Sale price $40.00
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An open source project developed by Arby Avanesian.

empirical water GLACIAL is a comprehensive mineral profile for brewing any coffee or tea, inspired by glacial water. empirical water is the only brew water on the market to make use of paradigm-shifting minerals like calcium carbonate and silica.

GLACIAL Profile: Harmonious, balanced, versatile.

TDS: 70 mg/L


  1. Large sweet spot — Dial into a bigger sweet spot, courtesy of calcium carbonate.
  2. Adjustable for any roast — Refer to the Buffer Guide down below.
  3. Clean depth — Mute funky off-notes without reducing desirable flavors.
  4. Espresso AND filter-friendly — Barely scale-forming in the kettle. Descale your espresso machine once every 1000 shots pulled.
  5. Silica* — A syrupy sweet mineral that also boosts mouthfeel and aftertaste. *Included in your hardness concentrate if selected.

Dilute with zero TDS water.

Ships free to USA and Canada! International customers pay a flat rate of $29 for shipping and are responsible for duty fees.

World Class Testimonials

Jibbi Little — 2022 World Aeropress Champion

"I love the SPRING water for brewing coffee. It brings out floral and sweet notes, resulting in a clean cup without any bitter or drying aftertaste."

Sompetch "Pack" Katisomsakul — 2024 US National Brewer's Cup 3rd place

"I was pleasantly surprised when I first tried empirical water. When I brewed a natural anaerobic coffee with it, the water softened the funky flavors, allowing hidden elements to shine with a clean finish, even as it cooled down. This water is excellent for enhancing the quality of your coffee. I highly recommend using empirical water to bring out the best flavors in coffee, especially in competitions, as I would do for myself."

What's in the box?

Your order contains:

  • Hardness concentrate — Comes in 1 liter bottle(s).
  • Buffer concentrate — Comes in 1 oz dropper bottle(s).
  • Extraction Booster — If selected, comes in 1/2 oz dropper bottle(s).
  • Hardness Measuring Cylinder — First order only, replacements offered as needed.
  • Info Card — A written introduction to empirical water and a convenient QR code to the User Guide.
  • Business Card — Includes the developer's personal phone number, email address, social media handle and subreddit.
  • 2 Stickers empirical water icon and wordmark.



Prepare in a 1 liter bottle, or directly in your kettle.

  1. Add 50 mL (or 50 grams) Hardness.
  2. Add 0.50 mL (or 0.590 grams) Buffer.
  3. Add 0.50 mL (or 0.590 grams) Extraction Booster (optional).
  4. Fill remaining capacity with zero TDS water (about 949 grams).

Coffee vs Tea

The Coffee and Tea Editions are pending differentiation. The Edition selector will stay up in the meantime to indicate that this water is suitable for both coffee and tea.

Buffer Guide

As a starting point for 1 liter of brew water, use:

  • 0.50 mL Buffer for light roast filter coffee and any tea.
  • 2x 0.50 mL Buffer for medium roast filter coffee.
  • 3x 0.50 mL Buffer for dark roast filter coffee and any roast as espresso.

For higher intensity and acidity, use less buffer. For lower intensity and acidity, use more buffer.


empirical water is the only coffee water on the market to incorporate silica, a mineral that occurs naturally in many of the world's finest mineral waters.

Silica boosts sweetness, mouthfeel, and aftertaste.

Some describe the silica sensation as experiencing the sensory characteristics of your brew in slow motion. Aromatics stick around in your nose, mouth and throat for minutes on end.

If selected, silica will be added to your Hardness concentrate.

Extraction Booster

The Extraction Booster is a dropper bottle of mineral concentrate, designed to increase flavor intensity and definition.

Mineral Composition


Harmonious, balanced, versatile.

TDS: 70 mg/L


Hardness: Calcium carbonate, magnesium sulfate, calcium chloride, magnesium chloride.

Buffer: Deionized water, sodium bicarbonate, potassium bicarbonate.

Extraction Booster: Deionized water, magnesium chloride, magnesium sulfate.

View full details

Bonuses with your order

50 mL Measuring Cylinder*

*At your request, a free 50 mL measuring cylinder is supplied to help measure your hardness concentrate.

If you lose or break your cylinder, leave an order note with your next order, and you'll receive another cylinder for free.

1-on-1 Brewing Guidance

When you're accustomed to brewing with the same water for a long time, it can be disorienting to make a switch - especially when the new water is unlike anything else on the market. That's why as the developer, I'm offering my time to personally assist you in bringing the best out of your coffee or tea with Empirical Water.

Guidance includes:

  • 1-on-1 Brewing Consultations — Your order confirmation includes my personal contact information. From then on, I'll be available 7 days a week to personally help you every step of the way to brew the best coffee or tea you've ever tasted. Text (or email) me about how your brews are going, and I'll be there to help you unleash the full potential of your brews.
  • Brew Video Analysis — Record your brew using your phone camera and send it over. I'll analyze your brew, help you figure out what's going wrong, and explain how to fix it.

Official Discord Access

Water is the most impactful brewing variable. So when you keep the water constant between your setup and someone else's, you gain the advantage of having truly consistent and valuable conversations around coffee.

In the Empirical Water Discord, you'll find people who brew similar coffees with similar brewing methods using the same water. There, you can directly copy already-perfected brew recipes with immediate success — for instantly dialed-in brews.

200% Extra Buffer

All orders come with triple the required amount of buffer.

With extra buffer, you can accomplish two things:

  1. Reduce harshness — Less bitterness and astringency.
  2. Boost texture — For lusciously thick brews.

Extra buffer generally translates to a better experience with medium and darker roasts.

Customer Reviews

Based on 30 reviews
Sweet! (literally)

love the water! i was actually quite blown away with the results. Was able to try 3 different coffees (2 brews for each coffee one using control water and other empircal water). TDS was on average ~0.1 higher for all the brews with empirical and all had noticeable differences in taste i wont note all but top of the list being a more sweet, like insanely sweet. I used 3 coffees that i know very well and honestly did not know these coffees could have as much sweetness as they did with said brews.

Christian Wicks
Water profiles

I taste tested the spring, glacial, and TWW:classic profiles ~a month ago. I preferred both profiles over TWW for more sweetness and nuanced flavors I obtained from my brew. I have since purchased the spring profile concentrate with Silica, due to preferring that profile because of increased the increased body. I am unfortunately not able to justify using this water everyday due to my budget, but use it when I am not working morning shifts to increase my enjoyment of my 'premium' coffee.

Anna Ropka

empirical water GLACIAL, v1.5 — Concentrate

Jake Davis

I have been using TWW for some time now. I ordered a sample of the Empirical’s Spring mix and found myself rediscovering a coffee I had been drinking for week. The Spring mix drew out many subtle notes and it double the cups clarity. I was converted. Highly recommend at least trying this product and I am confident that you will not be disappointed.

Michael Dericco
So good

Out of every water I have tried for tea this is by far the smoothest most drinkable and best for extracting.

Gregg Gusta
Definitely give this a try

I will be buying a concentrate soon. I got the formula 1.5 with extraction boost and.... I forget what the other plus was but it is the one that works for me. Good stuff. Good guy. Good coffee. Try it out.

A/B Cupping Results

Just did an A/B cupping of a September coffee using my normal 40/20/20 and empirical and the differences are huge.
- very upfront acidity
-low body
- I find more florals and herbal notes than sweetness with a clear delineation of flavor

- huge difference in body/mouthfeel
-very balanced with emphasis on sweetness
- some florals on initial sip but then goes to more darker fruit characteristics turning it juicy which is different . I find slightly less delineation with more blended flavor presentation.

They’re both really great and just highlights different attributes of the coffee so I can't say anything about “better” but definitely a viable option to consider .

J. M.
Very noticeable improvements

Great flavor, and very noticeable improvements in terms of texture and length of aftertaste. My tea was noticeably more viscous and oily, which was great. I also noticed a bit less astringency. Arby is doing good work here.

Ethan Adams
This is it.

I’ve been experimenting with water for a while; this formula has everything I’ve been aiming to achieve in a very approachable, user friendly experience. I will be buying this again. Id recommend this to everyone who is trying to elevate their coffee (and tea) experience.

I'm upset, in a good way

I'm kinda mad at how much better my tea was with Empirical Water.
The soup was thicker in a great way. Pulled more from the tea.