PROBLEM OF OLD FILTER KITThe old sponge filter has been aged and crushed after a long time of use, and it also developed a persistent bad smell, even after deep cleaning or changing the pre-filter. This is also the reason for the reduced suction. The solution is to replace our filter replacements upgrade kitUPGRADED FILTER KIT EFFECTAfter replacing our HEPA filter replacement and motor back cover replacement, a high-quality post-HEPA filter could increase 3 times suction performance, also could wash it for repeated use, and reduce the machine's working noiseWASHABLE AND REUSABLE FILTERAnimal filters could be simply rinsed with warm soapy water regularly, and let completely air dry out before reusing them. Simple, effective, easy to use, and clean, youll just love themSIMPLE INSTALLATIONDetailed assembly video QR code instruction comes with the package. Just need 1- 2 mins, to make the machine increase its performanceHELPFUL GIFTS TOOLOur gifts tool of power button trigger Lock and end cap key could help you more easily do the cleaning. The power button trigger Lock helps to control the power button on/ off lock and release. The end cap key could help to quickly open the end cap to replace other accessories