Cold-water brewing eliminates 66% of coffee acids. The exact process varies by equipment maker, but it generally involves mixing coffee grounds and cold or room-temperature water, allowing the mixture to sit for a minimum time of approximately 12 hours, then filtering it into a carafe. These are the typical steps for using a cold-water brewer:
- Place a pound of coarsely ground coffee in the top container, fill with cold water and let steep overnight. (Do not stir.)
- Remove plug to filter coffee concentrate into glass carafe.
- Add to cup with hot or cold water before drinking; start with 1 part concentrate to 3 parts water, then adjust measure to taste.
- Store the remaining concentrate in a refrigerator for future use.
The resulting taste is that of a strong but smooth coffee, without sharp edges. Those who employ it may not need to add as much sugar or cream to tone down the taste.