Fully compatible with ALROCKET air purifier BMJH06 This True HEPA Filter system contains 3-stage filtration: Pre-filter: Traps larger particles in the air like dust, hairs, pet fur, lint, and more True HEPA Filter: Captures 99.97% of airborne particles down to 0.3 microns. Blue Filter: Block large particles again. Using high efficiency air cleaner filters and replacing the filters regularly will help optimize air cleaning performance. Replace your 3-in-1 True HEPA Filter System every 4-6 months for optimal performance. Package inclued: 1 Pack premium filter 3 IN 1 FILTRATION: Pre-filter removes larger particles in the air like dust, hairs, pet fur; HEPA Filter captures 99.97% of airborne particles down to 0.3 microns in size such as pollen, dirt, pet dander; Blue Filter: Block large particles again EASY TO INSTALL: The BMJH06 HEPA filter is easy to be replaced and disposed of without any tool required. Replace every 4-6 months depending on the usage and environment. Fine pre-filter and blue filter block large particles and neutralize household odor 1 packs of BMJH06 replacement filter contained, fore best performance, please replace filter every 4-6 months