1. Compatible with PARTU BS-03 Purifier,This highly efficient replacement filter elements is fully compatible with BS-03 HEPA purifier part U and part X.2. A true HEPA filter can capture 99.97% of allergens in the , below 0.3 microns. Remove pollen, pet dander, mold spores, , etc.3. Pre-filter removes contaminants like pet hairs and dust. Activated Carbon Filter absorbs household odors from pets, cooking, smoking, and more.4. The 3-in-1 high-efficiency replacement filter includes a pre-filter, a real HEPA filter and an activated carbon filter.5. Easy to replace and dispose, no tools required.Replace every 6 months for optimal performance.Maintain strong suction and extend the service life of the purifier.colour: blackMaterial: composite material Package Contents: 1 * purifier filter elementsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.