About This 3 Stage Enhanced Filtration System: YIOU air purifier S1 replacement filter consists of Pre-filter, True HEPA filter and High-Grade Activated Carbon Filter.Only use YIOU air filter to keep your YIOU air purifier working at its best working condition. Non-woven Fabric Pre-filter: the first layer of YIOU air filter traps small airborne particles like dust, pet hair. True H13 HEPA Filter: the HEPA layer filters over 99% of particles down to 0.1 microns such as pollen, pet dander, dust, and smoke. Ammonia Removal Activated Carbon Filter:With the advanced carbon particle filter for ammonia removal, which can effectively remove the pet odors and trap the pet fur.Suitable for most indoor environments especially with pets. Helpful Information: each YIOU air filter is well-sealed to maintain its lifetime.It is recommended to replace filters for every 3-6 months. Overview Color : Blue Brand : YIOU Power Source : Electric Cable Control Method : Touch Filter Type : HEPA
