Replacement HEPA Filter for Pet Machine includes:

STAGE 1 - Large Particle Pre-filter that removes particles easily seen by the naked eye (e.g. dust, hair and pet dander)

STAGE 2 - Medium Particle Pre-filter that removes small to medium size particles (e.g. molds, spores and pollen)

STAGE 3 -15 lbs. of Specialty Carbons/Zeolite Blend that reduces odors caused by pets and other chemicals, gases and odors (e.g. ammonia and sulfuric acid)

STAGE 4 - 60 ft. of True Medical Grade HEPA which removes pet allergens such as dander and dust, as well as thousands of other micro-organisms (e.g. bacteria and viruses)