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I make large batches of cold brew once a month (almost 5 gallons) to fit into my kegerator and the process is really simple. For what it's worth, my coffee breaks down to about $1 a day for a large Nitro Cold Brew coffee on tap (which sells around me for nearly $4-5 a cup) and I get a lot more coffee, plus very high quality. You could get this price even lower without the kegerator because I included the price for nitro and I also use relatively expensive beans.

Here are the basic tools I would recommend:

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• brewing bucket or jar
  
• coffee grinder
  
• something to filter the coffee
  
• beans of choice (use whatever you like)
  
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  Depending on how much coffee you're looking to make, you can use a different sized vessel. For example, I use a 5 gallon bucket for my keg, whereas if you don't need that much cold brew at once, you can use something like a large mason jar or a smaller sized bucket (say 1 or 2 gallon bucket). I'll definitely recommend you get a bucket with a spout. This makes it very easy to dispense your cold brew.
  
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  As for a coffee grinder, buy what you can afford, there are plenty of options on the market. Obviously you're going to have a better grind if you invest a little more but if you can't, at the end of the day, it's not really going to break you. If you're doing large batches, I'd recommend buying an electric grinder. I use a Bodum Bistro Grinder which is less than $90 and works great. You could use a handheld grinder if you wanted to save more money, obviously it's just more work.
  
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  To filter the coffee, I use a fine mesh food grade bag (they sell these for things like almond milk) and sit that on top of a mesh strainer that sits on top of my bucket. You don't need the mesh strainer part, it just makes it easier for us since we have more coffee. You might want to strain your cold brew before you pour it but to be honest, I don't always and I don't have much problem. You can always double bag your beans to remove some of this too. Most of it settles on the bottom of the bucket underneath the spout anyway, so you just throw away that part.
  
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  Get whatever beans you like. I buy mine in bulk from a local coffee shop. I'd suggest doing a coarse grind and using a 2:1 water to coffee ratio until you figure out your particular preference. That would be to drink it straight out of the gallon. If you want to do more of a coffee concentrate, use more coffee and less water and then add water/milk/cream or whatever when you're preparing your cup.
  
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  I hope that helps. Enjoy!

I've tried several different setups over the years, but what I've settled on might be what you're looking for. It's super quick and easy, and there's very minimal cleanup involved.

I use these cold brew filter bags and a 32 oz. mason jar. The grounds I use are Stone Street Coffee Cold Brew Reserve, which are ground coarse. The grind is really important with these filter bags, because the finer the grind, the more you can put in. What I've found is that filling the bag all the way up with whatever grind setting Stone Street uses gets me the ratio I like with a mason jar. I let it sit on the counter for 20-24 hours, then when it's ready I just remove the bag, and then transfer the grounds into a 32 oz growler. I then add some more water to fill up the growler and keep it in the fridge. I like the growler because it doesn't spill as easily as a mason jar.

For me personally, this brew method tends to be a bit strong, so I'll add water to my glass when I serve it, and sometimes I'll go ahead and add water to the growler. I drink my coold brew black, and while I love the taste, sometimes it can be a bit strong for me, even with cold brew. I'm also a bit sensitive to caffeine and I don't like having too much in one sitting, so watering it down helps.

The aesthetics look really awesome. I've seen many dutch coffee devices being used in South Korea. Like this one from Amazon

https://www.amazon.com/Yama-Glass-Maker-Straight-Black/dp/B004EBUZ1A/ref=pd_sim_79_6?ie=UTF8&dpID=41tRrVDoWJL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&psc=1&refRID=D620MKJ5734WVNBTRF3Q

Most of them are big (which may be good for displays in coffee shops), and like you said, the openings allow dust and air to enter. I think that's why these dutch coffee tasted so acidic from being oxidized. Have you guys tested if your coffee is less acidic than regular dutch coffee since there's less oxidation?

1. How often do you have to replace filters? And will they be expensive to purchase? (With SS filter, do you never have to buy a new one?)
   
2. Does the unit have any thermo-resistance? Sometimes ice melts too fast in the chamber, or the coffee at the bottom warms up too fast and becomes oxidized (especially in summer). It would be cool if there's some thermal resistance so ice melts slow and the coffee at the bottom stays cool. How do you maintain that "constant temperature" that you mention on the website?
   
3. Will the brewing rate become slower as the filter gets clogged up?
   
   As a Korean, I think one of the biggest up-sell is that it prevents "dust" from entering. Korea is currently suffering "micro dust" problem and they are obsessed with preventing dust in any possible way. The fact that this prevents dust and purifies water, it could be a huge up-sell there.
   
   In the future, do you guys plan on making larger version for commercial use? Like at coffee shops? Will you guys ever export to Korea?
   
   EDIT: Haha, I just realized this was being made in Korea after reading Amazon product page.
   
   https://www.youtube.com/watch?time_continue=71&v=4czF1u4tixo
   

I use something like that from Amazon. Here’s an awesome tip for you. Rather than putting the grounds in the strainer, I just add it directly into the mason jar and let it sit over night without inserting the cylinder strainer. Then when it’s done cold brewing, I insert the strainer to filter out the big particles and then put this flip top cap on it to pour over into a separate container while using a nut mesh bag to get the finer particles.

Fliptop cap for mason: Drink, Pour, Store! Wide Mouth Mason Jar Flip Cap Lid by County Line Kitchen with Airtight, Leak-Proof Seal and Innovative Flip Cap (WIDE MOUTH, Blue, 1 Pack) https://www.amazon.com/dp/B0776YQTLS/ref=cm_sw_r_cp_api_i_tV.CDbG70SRQF

Nut bag mesh strainer:
2-PACK Best Nut Milk Bag - Restaurant Commercial Grade by GoNuts - Cheesecloth Strainer Filter For the Best Almond Milk, Cold Brew Coffee, Tea, Juicing, Yogurt, Tofu - BPA-Free Nylon 12"x10" Fine Mesh - Durable Washable Reusable - FREE Recipe E-book https://www.amazon.com/dp/B00WFU80KA/ref=cm_sw_r_cp_api_i_-X.CDbF4N6DW3

I use this mason jar and these bag filters. I fill up the filter bags full with fresh coarse-ground coffee, tie it, plop it in the jar, and let it sit 12-16 hours. It has turned out well with the few beans I've tried, yields a concentrate that I dilute 1:1 with water.

I used to use the steel mesh filter that came with that mason jar, but it lets through fine particulates from the grounds. You can probably get the jar for less, but you could probably use that and just pour through a filter without using the bags.

So... mess around with what you got, if it's too strong, water it down. Doesn't have to be a perfect science as long as it tastes good!

Must thank /u/nom_deguerre for the comments made in this [thread] (https://www.reddit.com/r/coldbrew/comments/5159wk/made_my_first_batch_and_its_sludgy/)

Been experimenting for several weeks using the ball jar and paper filter method and had amazing beginners luck. Really rich pleasant coffee, actually slightly sweet, no acid. So convinced I was on the right track I bought one of these 64oz Cold Brewer from Amazon. First batch NOPE! All the little subtle flavors were gone. None of the little interesting nuances that made it taste like a coffee shop were gone. The stainless steel sleeve that filters the grounds from the brew had to be the culprit as that is the only thing I did different. Made 2 more small batches to confirm and the Stainless Steel Filter batch was tasteless. So now I roughly follow their ratio of two cups coarsely ground beans and fill the large Ball Jar to the top. Tightly closed I shake it it a few times the first day, top it off as the coffee absorbs some of the water and then leave it in a shady corner for 16 to 24 hours. Filter it with paper filters into smaller Ball jars and cut with water, milk, or just ice for ice coffee. Makes enough coffee to last the two of us several days. This is the first recipe I used to make the little batches NYTimes but adjust everything till you find it to be to your liking.

tldnr: filtered water, coarse grind, no metal, paper filters.

I like your setup! I started with a Toddy, but when we were traveling I bought two nut milk bags that I've been using since. I steep the water and coffee in a regular pitcher, then pour through the bag when I'm done. It's replaced my Toddy now. Super cheap, portable, and makes great coffee.

Stone street cold brew. Pricey, but probably the best cold brew I’ve made. https://www.amazon.com/Stone-Street-Coffee-Colombian-Coarsely/dp/B01HFK955I

If your on a budget, Trader Joe’s has really cheap coffees that are good. I forget which ones good, I think it had a big Tucan bird on it.

I used these filters plus 150g of coffee + ~6 cups of water per jar - a mix of 8 o'clock coffee and Starbucks. Both were whole bean, various dark bean flavors. I ground them in a regular electric coffee grinder on coarse (maybe I'm just used to doing that for French press), distributed them to their filters, rubber banded them, and stuffed them into 1/2 gallon mason jars. I am looking for larger, wider-mouth jars on amazon ATM because the only difficulty is trying to squeeze the water-laden filters OUT of the jars after brewing is complete. They usually tear, which isn't a huge deal, as I pour all of the coffee out first.

Once done, I'll have 3.5ish jars of cold brew coffee. At 150g, it's just the right strength for me. I usually don't take cream or use ice. I don't know how long these keep in the fridge because I've always drank it all within 2 weeks. I've heard anywhere from 2-4 weeks for shelf life. I may save a bit in a smaller mason jar for a month to test that out.

6 cups of water to 150g water seems to be about the perfect mix after much trial and error.

And yes, there is a definite quality difference between coffees. Mixing 8'oclock and Starbucks is a good taste for me that's not terribly expensive. I'd love to find a nice dark bean as oily and rich as SB but cheaper online - any suggestions?

Nothing glamorous but this brews cold coffee and is easy.

She might want to take an extra step at the end and filter through a paper filter to catch smaller grains. But overall a good easy product to use.

https://www.amazon.com/Takeya-10310-Patented-Airtight-Silicone/dp/B00FFLY64U?th=1&psc=1

There a lot of more expensive options out on the market, just depends on what you are looking for in a brewer.

Search this subreddit for takeya and you can read about everyone else’s experiences.

I really want to get one, but it just doesn't brew enough for me. I brew 64oz every few days, so the size wouldn't cut it. I've messaged them multiple times suggesting a bigger one, who knows if they'll follow through.

Edit: For the record, here is one of my favorite devices for cold brew. Cheap, and brews 64oz easily!

https://www.amazon.com/Takeya-Flash-Chill-Maker-Quarts/dp/B0095ZBJT2/ref=sr_1_1?s=kitchen&ie=UTF8&qid=1486419399&sr=1-1&keywords=takeya+2+quart

It has to be like Stok? Stok isn't very good in my opinion and 6 hours to brew is too short. Even the 10 hours Stok's claims to brew is too short. Just buy a mason jar, pour grounds in and fill with water. Let it sit in the fridge for at least 18 hours. Buy an extra fine reusable filter and use that to filter out the grounds.

Here's what I use:

https://www.amazon.com/gp/product/B01JN2K046/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

I use these grounds and love it:

https://www.amazon.com/gp/product/B01HFK955I/ref=oh_aui_detailpage_o03_s00?ie=UTF8&th=1

Don't have one either but you're definitely paying for a e s t h e t i c with the Blue Bottle one. You can save ten bucks by getting a regular Hario bottle in brown on Amazon. This is the same thing, just blue.

Lazy link: https://www.amazon.com/dp/B00TF7WSVI/ref=asc_df_B00TF7WSVI5104127/

[Baratza Encore] (https://www.amazon.com/Baratza-Encore-Conical-Coffee-Grinder/dp/B007F183LK)

Family members love it and it has lasted for them. I'm doing aeropress as well so this works for me. If you are making your own espresso at home though I've read that you should go with their higher end model.

Fits my Mason perfectly and two lasted two years!

https://www.amazon.com/gp/product/B00QG1Y18E/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

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So on my second set; all I use, and use it a lot!

I have the Bodum Bistro Burr Grinder, the black one is currently (like at this moment and can change at anytime because Amazon) just $62
https://smile.amazon.com/Bodum-Grinder-Electronic-Continuously-Adjustable/dp/B0043095WW/

I like this one because it doesn't require a lot of cleaning. It is, I don't think, good enough for an espresso machine, but for cold brew and French Press brewing it is really good.

I have [this one] (https://www.amazon.com/gp/product/B00I7JKAQ0/ref=oh_aui_detailpage_o05_s01?ie=UTF8&psc=1) and it has done well for me, I make it strong, and dilute the batch in a 3 liter jug

Nut milk bags from amazon or local store. Filter it down to a very clear consistency.

Pro Quality Nut Milk Bag

I think the brand makes a big difference.

Stone Street Coffee Cold Brew Reserve Colombian Single Origin Coarsely Ground Coffee - 1 lb. Bag - Dark Roast https://www.amazon.com/dp/B01HFK955I/ref=cm_sw_r_cp_apa_i_R1wCDb3A5VKB8

Is my favorite so far.

What about making half gallon batches? I have two of these and use cheap half gallon Mason jars. Easy to put a half gallon jar in the fridge door/ easy to rotate out. Plus if for some reason I or the girlfriend get tired of it halfway through the week, no big deal.


https://www.amazon.com/dp/B01HIT0XCA/ref=cm_sw_r_cp_apa_BSaeAbG6FTXM0.

Nitro Cold Brew Coffee Maker - Mini Keg Dispensing System - Home Brew Kit - by HB Brewing https://www.amazon.com/dp/B07TXWR6X4/ref=cm_sw_r_cp_api_i_aQrJDbZ1SVGVH

https://www.amazon.com/gp/product/B01JN2K046/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

https://www.amazon.com/Reusable-Eco-Friendly-Bacteria-Resistant-Bolio/dp/B06ZY3FM1T?th=1

This one is organic hemp but that's not why I posted it.

Here's another option:

https://www.amazon.com/Hario-DFN-3-Filter-Handle-Woodneck/dp/B000ANBB32/ref=sr_1_4?s=home-garden&ie=UTF8&qid=1539695547&sr=1-4&keywords=cloth+coffee+filter

I use a nut milk bag. It works wonders. I haven't had a "stuck" drip since I got one, and I can now use a variety of grind types (prior to getting the nut milk bag, I only used coarse grind, as other grinds were too prone to clogging the filter).

I wouldn't​ go back to just using the Toddy filter. This is the one I use: https://www.amazon.com/gp/aw/d/B00KLT6X9W/

Give it a shot.

Buy a 5-6 dollar mason jar from Target and order these bags off of Amazon https://www.amazon.com/Mess-Cold-Brew-Coffee-Filters/dp/B072MGP456/ref=sr_1_6?ie=UTF8&qid=1549695062&sr=8-6&keywords=cold+brew+filter

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This is what I started with and have had no reason to do anything differently

This is what I use:
https://www.amazon.com/gp/product/B01HIT0XCA/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

I also like Stok.

I've tried using more expensive beans with similar results.. The taste was horrible.

I've gone back to a cheap breakfast blend. I use a mason jar and my brew soaks for at least 48 hours.