The Fermus 32oz filter is a high-fidelity utility component for mason jar brewing. It uses a 150-mesh count stainless steel weave, providing structural rigidity that prevents the metal from "oil-canning" or popping under the weight of wet coffee grounds. The included high-density silicone seal ring is specifically engineered for the 86mm diameter of standard wide-mouth jars, helping to ensure a consistent seal even if there are minor irregularities in the glass rim.
When using this filter in a 32oz jar, it leaves about 1.5 inches of space at the bottom. To get the most flavor out of your brew, it's helpful to use a coarse grind similar to sea salt. This ensures that the grounds stay submerged without becoming overly compressed, which allows the water to flow through the filter more effectively during the extraction process.
Functional Benefits
- 304 Stainless steel is non-reactive and prevents rust during long steeps.
- Silicone ring provides a tight seal to keep out refrigerator odors.
- Standard sizing works with any brand of wide-mouth canning jar.
If you prefer an ultra-fine mesh specifically marketed for sediment-free coffee, the Iaesthete Cold Brew Filter is another excellent choice. Check out our large airtight containers for keeping your coffee beans fresh.
