Reusable Cold Brew Filter
Alternative to paper filters and nylon sacks.
CoffeeSock ColdBrew filters are a reusable alternative to paper filters and nylon sacks. They are durable and may last a year or more.
These filters out-perform any comparable disposable and reusable filters. Cotton absorbs some of the oils released from coffee beans yet lets acids pass through. The resulting cup is clear crisp, rich and robust with all the acid of paper brewed coffee, without the paper taste, and all of the richness of French press without the heavy oiliness. Cotton imparts no flavor on the finished brew unlike paper.
Made to Fit: Quart (32oz) Mason Jar
Made from Organic Cotton - a responsibly produced, renewable resource
Initially, boil new filters in fresh water to clean and shrink for 10 minutes.
Fit ColdBrew filter over lip of wide-mouthed canning jar.
Add desired amount of coarsely ground coffee.
We recommend 3 ounces by weight (1 cup dry) per 32 ounce serving.
Wet (bloom) the dry coffee and let set for 30 seconds, allowing the water to fully penetrate the coffee grounds from the center. This is necessary to maximize flow and to avoid dry pockets, and weak brew.
Add filtered water in batches or very slowly, to fill.
Close filter by gathering the top of fabric together, wrapping the strap around the gathered neck of the filter, and pass through the attached ring (see video).
Times vary with volume of brew and ambient temperature. Warmer temperatures and shorter brew times yield a brighter and less extracted brew. Long cold soaks produce rich and smooth brews.
Brew Time Chart
32oz 64oz 1 Gallon 2 Gallon
SunBrew 4-6 hrs 5-8hrs 6-10hrs 12-sundown
ShadeBrew 5-8hrs 6-10 hrs 12-16hrs 14-18hrs
ColdBrew 6-10 hrs 12-16 hrs 14-18 hrs 16-20hrs
After brewing, discard grounds (great for the compost), and thoroughly rinse filter.
Easy cleanup - Just empty grounds, rinse, and hang to thoroughly dry.
Once every 6-8 weeks, boil filters in fresh water for 10 minutes to remove accumulated oils. If the filters are soiled with perishable food at anytime, boil for at least 10 minutes to sanitize. Additionally, you can add a scoop of baking soda to further enhance your filter.
End of Life Instructions
Cotton can be composted. Each pack lasts about 1 year and replaces approximately 500 paper filters.
Where It Comes From
CoffeeSock filters are made in Austin, Texas. All filters are sewn and packaged by happy human beings making a fair and living wage.