Core 300 Replacement Filter for LEVOIT Core 300, Core 300 P, Core 300S Vortex Air Air Purifier, 3 in 1 H13 Grade True HEPA Filter Replacement 2 Pack, Compare to Part No. Core 300 RF (White) FIorida Crystals Wear it for 45 minutes Mr Kipling Wear it for 45 minutes to 1 hour or overnight for a relaxing experience medical activities Work Great As Name Brand Filter Multiple tests in our factory have proven that Colorfullife core 300 replacement filters are fully compatible with LEVOIT Core 300 Colorfullife laboratory has conducted multiple tests for levoit air purifier replacement filter to ensure that each core 300 filter can be used for at least 3 months or longer