How To Make Five Gallons Of Cold Brew Coffee

Quick answer

• Use a large food-grade container. Think 6-7 gallons to give yourself room.
• Coarsely grind your coffee. Think sea salt, not sand.
• Aim for a 1:4 coffee-to-water ratio. That’s about 5 lbs of coffee to 1 gallon of water.
• Steep for 12-24 hours. Longer means stronger.
• Filter twice. First through a coarse mesh, then a finer filter.
• Dilute to taste. Cold brew is potent.

Who this is for

• For serious coffee lovers throwing a party or stocking up.
• For cafes looking to make a big batch for the week.
• For anyone who’s ever thought, “I need more cold brew, like, yesterday.”

What to check first

• Brewer type and filter type: You’re not using a drip machine here. You need a big, clean vessel. Think a food-grade bucket, a large pitcher, or even a brewing bag system. For filtering, you’ll want something that can handle volume without clogging. A large mesh strainer is your first pass, followed by cheesecloth, a fine-mesh sieve, or even a dedicated cold brew filter bag.
• Water quality and temperature: Use filtered water. Tap water can have off-flavors that will carry into your cold brew. Room temperature is fine for steeping. No need for hot water here, that’s for hot coffee.
• Grind size and coffee freshness: This is key. You want a coarse grind. Think chunky. If it’s too fine, you’ll get sludge and over-extraction. Freshly roasted beans are always best, but for cold brew, even slightly older beans can work well since the long steep time smooths things out.
• Coffee-to-water ratio: For a concentrate, a good starting point is 1:4 by weight. So, for 5 gallons of water, you’re looking at about 5 pounds of coffee. This makes a super-strong base you’ll dilute later. Don’t be shy with the coffee.
• Cleanliness/descale status: Everything that touches your coffee needs to be spotless. Rinse your container thoroughly. Any residual oils or old coffee bits will make your batch taste bitter or stale.

For filtering, you’ll want something that can handle volume without clogging. A large mesh strainer is your first pass, followed by cheesecloth, a fine-mesh sieve, or even a dedicated cold brew filter bag.

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• Cold brew bags bulk: You will receive 150 pieces disposable cold brew coffee filter bags with drawstring. Enough quantity can meet your daily needs and share them with your family or friend
• Filter bags size: Each cold brew coffee pouches measures 4x6 inches/ 10x15 cm, can hold a cup of coffee grind and suitable for 32 oz jars. After brewing, put it in the refrigerator and enjoy the delicious cold brew coffee after 12-24 hours
• Material: These disposable coffee filter bags are made of degradable non-woven fabric, safe and odorless. The drawstring is designed to be easy to use, and the top drawstring prevents internal particles from escaping
• Fine mesh design: These cold brew pouches have sturdy double thread stitching and fine mesh design that allows the water to fully soak the coffee powders, whether coarse, medium and fine. No flavor is affected and no particles remain
• Multi-purpose: These large tea bags can be used for hot and cold brew coffee, and are also suitable for loose leaf tea, herbs, soup stocks, spices, hot pots, seasonings, foot baths, etc

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Step-by-step (brew workflow)

1. Gather your gear: You’ll need a large container (6-7 gallons), a scale, a grinder, and your filtering setup.

• What “good” looks like: All your equipment is clean and ready to go.
• Common mistake: Forgetting a crucial piece of equipment. Double-check before you start.

2. Measure your coffee: Weigh out approximately 5 pounds of whole bean coffee.

• What “good” looks like: The beans are ready for grinding.
• Common mistake: Guessing the amount. Use a scale for consistency.

3. Grind your coffee: Grind the beans to a coarse consistency, like sea salt.

• What “good” looks like: Uniform, large particles. No fine dust.
• Common mistake: Grinding too fine. This leads to a muddy, bitter brew.

4. Add coffee to the container: Dump the ground coffee into your large brewing vessel.

• What “good” looks like: All the grounds are in the container.
• Common mistake: Spilling grounds. A wide opening helps.

5. Add water: Measure and pour in about 5 gallons of filtered water.

• What “good” looks like: The water is evenly saturating the grounds.
• Common mistake: Not saturating all the grounds initially. Stir gently.

6. Stir gently: Give the mixture a gentle stir to ensure all the coffee grounds are wet. Don’t over-agitate.

• What “good” looks like: A consistent slurry of coffee and water.
• Common mistake: Stirring too vigorously. This can break up grounds and lead to bitterness.

7. Cover and steep: Seal the container tightly and let it sit at room temperature for 12-24 hours.

• What “good” looks like: The container is sealed and undisturbed.
• Common mistake: Leaving it uncovered. This can let in contaminants or cause evaporation.

8. First filtration: Set up your large mesh strainer over another clean container or bucket. Slowly pour the steeped coffee through it.

• What “good” looks like: Most of the liquid is captured, leaving behind the bulk of the grounds.
• Common mistake: Pouring too fast. This can cause overflow and make a mess.

9. Second filtration: Now, filter the liquid again using cheesecloth, a fine-mesh sieve, or a dedicated cold brew filter. You might need to do this in batches.

• What “good” looks like: A clear, rich liquid with minimal sediment.
• Common mistake: Not filtering enough. Sediment will end up in your cup.

10. Dilute and serve: Your cold brew concentrate is ready. Dilute it with water or milk to your preferred strength, usually 1:1 or 1:2.

• What “good” looks like: A smooth, delicious drink.
• Common mistake: Drinking it straight. It’s super strong!

Common mistakes (and what happens if you ignore them)

Decision rules (simple if/then)

• If your cold brew tastes weak, then increase the coffee-to-water ratio next time because you didn’t use enough coffee.
• If your cold brew tastes bitter, then grind coarser and filter more thoroughly because you likely over-extracted or had too many fines.
• If your cold brew has sediment, then filter it again using a finer medium because your initial filtering wasn’t sufficient.
• If you want a stronger concentrate, then steep for longer (up to 24 hours) because time is your friend with cold brew.
• If you notice off-flavors, then switch to filtered water because tap water can carry unwanted tastes.
• If your brew is cloudy, then you probably ground too fine or didn’t filter enough, so adjust your grind and filtering process.
• If you’re making a large batch for a party, then plan your steeping time so it finishes just before you need it because fresh is best.
• If you’re new to cold brew, then start with a 1:4 ratio and 18-hour steep time because it’s a good baseline.
• If your coffee smells musty, then check your equipment for cleanliness because residual oils can go rancid.
• If you’re storing the concentrate, then keep it in an airtight container in the fridge because it will stay fresh for about two weeks.

FAQ

How much coffee do I actually need for 5 gallons?

For a concentrate, aim for about 5 pounds of coffee beans. This makes a strong base that you’ll dilute later.

What kind of coffee beans are best for cold brew?

Medium to dark roasts generally work well, but experiment! The long steep time mellows out most bean characteristics, so don’t be afraid to try different origins.

Can I use pre-ground coffee?

You can, but it’s not ideal. Pre-ground coffee is usually too fine for cold brew and will result in a muddy, bitter concentrate. If you must, look for coarse-ground coffee.

How long can I store cold brew concentrate?

Stored properly in an airtight container in the refrigerator, cold brew concentrate can last for about two weeks.

Do I have to filter it twice?

It’s highly recommended. The first coarse filter removes the bulk of the grounds, and the second finer filter removes smaller particles and sediment for a cleaner taste.

What’s the difference between cold brew concentrate and ready-to-drink cold brew?

Concentrate is a very strong coffee base that needs to be diluted with water or milk. Ready-to-drink cold brew has already been diluted to a drinkable strength.

Can I use flavored coffee beans?

Sure, but be mindful that the long steep time can sometimes mute or alter the flavorings. Natural flavorings tend to hold up better.

What if I don’t have a container big enough?

You can make multiple smaller batches and combine them. Just make sure each batch follows the same ratio and steep time.

What this page does NOT cover (and where to go next)

• Specific cold brew maker recommendations. (Check out reviews for dedicated cold brew systems.)
• Detailed flavor profiles of different coffee origins for cold brew. (Explore coffee blogs or roaster websites.)
• Advanced techniques like nitrogen infusion or flash chilling. (Search for articles on specialty coffee preparation.)
• Troubleshooting very specific taste issues beyond general bitterness or weakness. (Consult advanced brewing guides or forums.)