Replacement pre-filter for LivePure Sierra Series Medium Tower Air Purifier. Natural coconut carbon based pre-filter reduces VOCs and household odors from cooking, cleaning, smoking and pets. Also captures larger particles before reaching the HEPA filter, extending the life of the HEPA filter. Recommended to replace every three (3) months for maximum efficiency, or more often in harsh environments. Fits LivePure Air Purifier Models: LP200TH, LP200TH-MSB, LP200TH-TPW. Package contains two (2) replacement pre-filters.