Work in Progress. Still trying to figure out the filter part. Goal is to have a simple, clean, and efficient way to make delicious cold brew at home. Print Connector Ground Coffee Size of Sea Salt Mix one part coffee one part water in one mason jar attache connector and second mason jar, like an hour glass of caffeine, and let sit for 12 hours flip mason jar and drip, drip, drip you got some tasty, less acidic cold brew. Enjoy!