General description Filters help maintain the cleaning performance of your Dyson DC19, DC20, and DC20 Pre vacuum cleaners, while reducing the infiltration of dust, pollen, and other allergens into the air you breathe. The 2-in-1 blue rear-mounted Dyson vacuum cleaner filter is perfect for pet owners. The Eco-Ready, anti-allergy, and Power filtration functions will keep your home clean. Usage For best results, it is recommended to replace the filter every 2-3 months to ensure optimal performance.