This project is suitable for DX115 DX115S DX115C portable vacuum cleaner For best results, the filter should be replaced every 2-3 months. The filter can fine dust with a diameter of 0.3 micrometres or larger, effectively filtering pet hair, dust and other pollutants. Keep your vacuum cleaner at its best performance! Our maintenance kit can meet all your needs, including HEPA filters As part of routine maintenance, it can be easily removed and replaced.