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LIFA air LA503 Series Spare Filters LA32 + LA22 Air Replacement Filter but you would have toDescription For LIFAair LA503 Air Purifier A spare filter for the LIFA air LA503 smart air purifier. The LIFA air combination HEPA12 grade filter will remove over 98% of PM10 and PM2. 5 pollutants while the organic compound filters absorb harmful gases like formaldehyde. The smart sensor on your LA503 air purifier will inform you once the filter requires changing based on air quality and air flow. A single filter lasts for about 1 year of use. Choose