The Absolute Best Water To Use For Iced Coffee (And Why It Matters) - Tasting Table
Briefly

The article emphasizes the importance of water quality in brewing iced coffee, highlighting that filtered water is typically the best choice. Coffee expert Mathew Woodburn-Simmonds explains that the mineral content in tap water can greatly affect the extraction process, leading to flavors that may be dull or bitter. Water with high mineral content, particularly chlorine and other contaminants, can ruin the overall taste. A clean and rich flavor is best achieved with water free from these substances, making filtered water the ideal option for coffee lovers.
Filtered water is generally the best choice for brewing iced coffee, though it depends hugely on where you are and what the mineral content of your tap water is.
Ensuring your water has had the various chemicals and minerals removed from it before starting will help you get a clean, rich flavor.
If you have 'hard' water, with lots of minerals like calcium or magnesium in it, [it] can affect extraction, leaving you with dull or bitter coffee.
The best coffee is made with water that's free from chlorine, iron and sulphur compounds; a high presence of these minerals can affect the flavor, balance, and aroma.
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