Cold Brew Mason Jar Filter


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Transform your mason jars into a cold brew maker and enjoy the smoother, more flavorful, less acidic taste. This filter fits right over the wide mouths of two mason jars to sieve out the coffee grounds.

  • Made in the USA: West Bloomfield, MI
  • Materials: High Density Polyethylene (HDPE), stainless steel, vinyl
  • Care: Hand wash with soap and warm water
  • Filters coffee grounds
  • Unique filtration system
  • Filter fits any standard wide-mouth mason jar
  • For use with mason jars only
  • Please note: Mason jars not included
  • Dimensions: 3.5" diameter x 1.25"
  • Weight: 0.5 lb.

64 Reviews (3.1 out of 5 Grommets)

Sorted by Rating

Works as advertised

5/20/2019 by Vic

Works well and saves space in Fridge. Use frequently as we all enjoy cold brew.


Easy To Use

4/13/2019 by Michael

This filter is easy to use with standard canning jars to create delicious cold-brewed coffee. The price is very reasonable.


Cold Brew Lid

4/1/2019 by Claire

Awesome unit!!
Makes cold brew coffee Easy!!
Couldn't be happier:)
Grommet makes LIFE easier;)


bought as a gift

3/30/2019 by BONNIE

Can't tell you you too much as I bought it as a gift. But so far my friend is having fun with it as she works out the ratio of water to coffee.


Coffee all summer

10/18/2018 by Elisabeth

These filters are such a great invention. The cold brew is great for supplementing the frozen coffee cubes I use to make coffee frappes'.

Items 1 to 5 of 64 total

BRUW | Cold Brew Mason Jar Kit

About BRUW

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.