Cold Brew Mason Jar Filter Case of 15

Reviews (3 out of 5 Grommets)

Sorted by Rating

Greta idea

5/19/2017 by Judy

This is a great idea. Works like it says. The only problem is that some of the ground coffee filters through and is left on the bottom of the jar with the filtered coffee. I may have used too fine of a grind but surprised it filtered through because of the really fine mesh. Had to shake it up several times because of the fact that the grounds collect on the mesh but expected that to happen. Would buy it again and looking forward to using it a lot this summer.


Tricky to use, but coffee tastes great

4/12/2019 by Joanne

I wanted to really love this gadget. I liked the idea of re-purposing Mason jars (of which I have many) and I love low-tech solutions. I've made coffee with this filter a few times, and while the coffee comes out very tasty, the filter is tricky to set up, and kinda messy. I already know how to grind and brew hot coffee, and I'm generally pretty handy with kitchen gadgets, but this one is tricky to get working. Issue #1- once you screw on the filter and flip, it filters VERY slowly. Sometimes it stops completely. Yes the instructions say to "tap" the jar, but I literally had to shake it. Issue #2- every time I've used it, it leaks a little around the screw band. My coffee jar ends up sitting in a puddle of coffee, no matter how carefully I screw in each jar, no matter how tightly. So I have to filter it in the sink. It's an interesting idea, but it's a fair amount of fussing for a couple of mugs of coffee. I will give it a few more weeks, to discover if there are any tips I'm missing (different grind or different roast, that will not clog the filter? And pick 2 different jars that may give a better seal?). Was expecting to be more impressed, and I'm just not getting the brew-hah-hah over this gadget.


Good idea but needs improvement

12/16/2018 by Mary Ann

The air tube becomes blocked with grounds when you invert it, brewed coffee takes forever to drain. Trying to McGyver it with an inner narrow stick with a flat disc on the end that would close the tube but then float free or be pushed free to prevent this. Otherwise the brewed coffee takes hours to drain and it is very messy to disassemble. Needs work.



5/16/2018 by Patricia

Great if you use the mason jar filter



3/20/2018 by catherine

It is an innovative idea but it often does not work as it did the first time I used it.... Will keep trying


a little disappointed at first

11/10/2017 by irene

hard to use if you only have drip coffee grounds. the screen and the tube clog. will try again when I can get the right grind. What coffee I could get from it ( took a long time to filter) was great. very smooth taste, not harsh. will try again.


Not as I'd hoped

6/3/2017 by Laurie

I coarsely, ground my beans, but had cloudy coffee with sediment. It did not drip through readily in spite of taps, jostlings. I'm returning to my old bulky Toddy for cold brewing.


Good concept, has a few issues still

5/19/2017 by Kimberly

I wanted to love this. I have searched and searched for an easy, low mess way to handle cold brew coffee. I bought this filter alone because I already had a nice stash of 32 ounce mason jars. I use 2/3 cup of grounds and let it steep in the fridge for 24 hours. The problems arise when it comes time to drip. I have to continually shake the jars, lie them on their side and otherwise beg and plead for the dripping action to take place with assistance. Sometimes I'll get a nice rush of coffee dripping and then it will stop and nothing, no amount of shaking or re-positioning will get it to continue. I find the end of the straw will sometimes clog up with grounds so I need to unplug it. I have recently trimmed a tiny bit off the straw to see if that will help get better airflow although I may find myself with even more grounds issues now. I do not believe I'm being excessive with the amount of grounds I am using as it matches other systems suggestions and the coffee is just how I would like it to be. I'm not sure what more to do with it other than let it drip for an hour and hope that helps. It's still a very cool idea and I need to work with it. Oh, and the straw doesn't stay over the spot on the lid very well and falls off continually like it was too big. Careful placement in the jar helps for that.


What am I doing wrong???

7/8/2019 by Laura

I can’t get it to work right. The water just will not drain through the coffee after the first inch or so when I flip it. I keep shaking it to only get a few drops per minute. I left it on the counter to “ do its own thing” and the coffee never drained through the filter. My coffee is standard drip grind... not fine expression grind. I be tried it 3 times. Waste of money.


Labor intensive

1/9/2018 by Flossie

The coffee was delicious but the filter clogged up and did not flow into the other jar. It required tipping it back and forth many times just to get it to drain through.

Items 31 to 40 of 66 total

The BRUW Story

BRUW | Cold Brew Mason Jar Kit

Mason Brew

Make your very own cold brew coffee, easily. Put this cold brew coffee maker filter onto a wide-mouth mason jar.

It’s super straightforward. Let coffee grounds soak in a cold-water-filled mason jar for over twelve hours. When you’re ready to get your caffeine dose, twist the filter onto that jar with the straw side down. Then twist the second mason jar on top of the filter. Flip. Shake. And watch your cold brew filter through.

In case you’re uninitiated to cold brew, it’s smoother, less acidic, and it’s easier on your tummy (and teeth, too) than coffee brewed with heat. Less acidity also means
you can better taste all the subtle flavors—like traces of chocolate, fruit, and nut inherent in different beans.

And even though grown-ups are the ones most likely to enjoy their coffee, this filter was invented by a teen. Max Feber was just 16 when he came up with the idea. It’s one you’ll be able to enjoy every day.
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