Water hardness

Hard water is water that has a high mineral content. Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

LEAFSTEEP

The art of tea — steep times, ratios, and the culture of the cup.

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