A dust filter is created in tiny dust and to reduce secondary air pollution. HEPA filter is made of high-strength environmental-friendly materials, which can block most of dust down to 0.3 micrometer. The filter can maintain the cleaning performance of the sweeper, while reducing the penetration of dust, pollen and other into the air you breathe Easy to Assemble: This filter is inside the dirt tank. Remove the dirt bin by firmly grasping it and pulling it out, to empty the dirt bin, find the release latch and pull it to open and empty. Take out the old filter and then place the new filter back into the bin. Replacement Filter: A dirty filter greatly reduce suction power. Depending on the vacuuming frequency and amount of dirt cleaned, for best performance, change the filter at least every 3 to 6 months. Fine preliminary Filter traps larger particles in the air like dust, hairs, pet fur, lint and more Compatible with: For 800T 820T 820S 830T For C30B Colour:White Material:plastic Package Contents: 10 x HEPA Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.