The post-filter is folded multiple times to form a dense composite structure for highly efficient filtration. The vacuum cleaner uses a multi-stage filter system that can effectively trap particles as small as 0.3 μm with an overall filtration efficiency of 99.9%. The addition of pre-filters allows larger dust particles to be captured first, effectively reducing the filtration pressure. The filter set can be washed and reused after drying, making it easy to clean, economical and environmentally friendly.
