he HEPA filter will remove 99.9% of particles larger than 3 microns effectively removes pollutants such as pollen, dust, mold spores, fine smoke particles and more. Activated Natural Coconut Carbon filter effectively absorbs VOCs, odour and harmful toxins like paint fumes, cooking smells and other volatile organic compounds. Activated carbon filters can particularly benefit people who suffer allergies or irritation from impure air, including second hand smoke. Recommended filter change - Every 6 – 12 months depending on your environment. Compatible with Polperro 12L