• Patented Labyrinth pre-filters
• Extends the life of the main filter by capturing larger particles before they reach the HEPA filter
• Fits neatly under the main filter in integral Purex extractors
• Graduated fiber matrix delivers excellent particle capture capacity - up to 20 times more than a standard filter
• Ideal for medium-high volume applications
• Contains the particles inside for clean and simple disposal
• Composite material available for extra filter life and filtration down to 0.5 microns
• Standard captures particles to 3 microns at an efficiency of 60 to 80%
• Composite captures particles to 1 micron at an efficiency of 80 - 95%

Pre-filters are designed to capture larger particles before they can enter the main HEPA filter. Without pre-filters, the life of the main filter would be much shorter. A variety of media and designs are available to allow Purex extractors to be used in a wide range of processes.