Why Filter Beer?

Beer filtration is a multi step process and involves the use of many different types of filters. Filter bags can be used for:

• Hop removal
• Trap filtration
• General clarification
• Protection of cartridge filters

Common Applications of Filter Bags in the Beer Industry

Filter bags are integrated at multiple stages of beer production to address different filtration needs:

• Hop removal: Removal of fine hop particles.

• Mash Separation (Brew-in-a-Bag Method): In homebrewing and small-scale operations, filter bags are used to separate grains from the wort during mashing. This method allows brewers to steep grains directly in the bag, simplifying the process and reducing equipment needs. For recirculating systems, bags help maintain flow while capturing larger particulates.

• Trap Filtration After Fermentation: Post-fermentation, filter bags act as trap filters to remove residues like diatomaceous earth (DE) particles from bulk filtration, preventing off-flavors and haze. They protect downstream processes by capturing high particle loads.

• Clarification: Bags are employed to improve visual appeal without stripping essential flavors.

Recommended Micron Ratings

• Mash/Wort Filtration: 100–200 micron Nylon Mesh filter bag (retain large grain particles)
  
• Hop removal: 100 - 150 micron Nylon mesh filter bag (capture hop pellets, hot break)
  
• Cold Wort Filtration: 25 - 50 micron (reduce fine solids before fermentation)
  
• Post-Fermentation Yeast Removal: 1–10 micron (trap yeast cells, polish beer)
  
• Final Clarification Before Packaging: 0.5–1 micron (high clarity, remove residual haze)