Definition - What does Pre-filter mean?
A pre-filter is a device which removes unwanted large matters from the air or water. Air pre-filters include masks and respirators. Supplied air in the workplace or transport vehicles has air pre-filters to remove dust, hair, insects, pollen, fibers, etc.. Water pre-filters remove sand, fibers and larger pollutants of drinking water.
Safeopedia explains Pre-filter
Pre-filters of air purifiers and respirators use physical and or chemical processes with fibrous pleated paper, foam, cotton, ionizers, activated charcoal, absorbents, chemicals, catalysts etc. and clean the air to the designed level before it enters to other filters for further purifications. Air purifying equipment with prefilters is used in buildings, transports, public areas and industries. There are wide varieties of technologies and user defined requirements for air prefilters and therefore, there are no standardized regulations about the performance and effectiveness. Many commercial options for air prefilters are available for the use of air filtration units at homes, workplaces, hospitals, hotels, transports etc. and in the respirators used by individuals.
Water prefilters are used in water purifiers. These use physical and or chemical processes with fibrous pleated nylons, sands, pebbles, activated charcoal, chemicals, ultra violet ray etc. and clean the water before further purifications. Many commercial options for water prefilters are available for the use of water filtration units at homes, workplaces, hospitals, hotels, transports etc.