Mastering Water Chemistry for Coffee and Tea
You cannot brew a balanced cup with volatile water. Understanding how mineral content and filtration impact extraction allows you to control the final clarity and body of your morning beverage.
Start with neutral, filtered water.
If you would not drink a glass of your tap water straight, do not use it to brew. Filtration removes the chlorine that masks delicate aromas.
- Water testing strips
- Carbon block filter pitcher
- Digital scale
- TDS meter
Total Dissolved Solids (TDS)
TDS measures the concentration of minerals in your water. Aim for a reading between 75 and 150 parts per million for the most balanced extraction profile.
The method.
Assess your baseline
Use a TDS meter to check your tap water. If it is under 50, it is likely too soft and will over-extract, leading to a hollow, biting taste.
Filter out the impurities
Pass your water through a high-quality carbon filter. This removes chlorine, chloramine, and organic compounds that contribute off-flavors.
Adjust mineral content
If your water is too soft, add trace amounts of magnesium and calcium. For home brewing, pre-mixed mineral packets designed for coffee are the most consistent way to reach the ideal hardness levels.
When it doesn't go to plan.
Never use distilled water; it lacks the ions necessary for extraction and will result in a flat, dull cup.
Softening water with a basic pitcher filter removes chlorine but does not significantly change the mineral count.
Check your water after heavy rain or during summer months, as municipal water profiles can shift due to reservoir changes.
The ones that keep coming up.
Can I just use bottled spring water?
Some bottled spring waters are excellent, but they vary wildly. Check the label for a TDS count between 100-150 and use that consistently.
Will boiling water change the mineral content?
Boiling does not remove minerals; in fact, as water evaporates, the concentration of minerals increases, which can lead to scale buildup in your kettle.
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