Put the coarsely ground coffee beans and salt into the bottom of a large glass container and fill with room temperature filtered water. Leave out for 12-24 hours.
Strain the coffee one cup at a time through a fine mesh sieve lined with at least two coffee filters. Change out the coffee filters when needed.
Refrigerate for 12-24 hours, dilute with equal parts water, cream, or milk and serve over ice.
This cold brew coffee concentrate will stay good for up to two weeks in your refrigerator. The filtered water helps maintain the purity of flavor for the cold brew. Tap water sometimes interacts with the grounds and impacts how it tastes. Learn more here.