This cloth filter has a particulate rating of 6 microns and can be installed for all general vacuuming applications where water is not present.This cloth filter can be continuously used for many years as it is a cleanable & washable accessory.This cloth filter is for general purpose applications when vacuuming dry debris such as wood shavings, wood dusts, general dirt & dust etc.It is possible to use KP700-19 “FILTER CARTRIDGE 3 MICRON” in conjunction with this filter cloth hat for additional debris filtration requirements.NOTE: A VACUUM FILTER ONLY WORKS WHEN IT IS CLEAN! IT IS RECOMMENDED THAT THE FILTER BE CLEANED REGULARLY (PRIOR TO EACH USE & PERIODICALLY DURING USE) SO THE FILTER CAN FUNCTION CORRECTLY. CAUTION: DO NOT USE CLOTH FILTER IN WET VACUUMING APPLICATIONS.