Dreame RHF1 vacuum accessory/supply Filter Robot vacuumThis filter contains a 0. 3 micron element to effectively trap ultrafine particles. With E11 grade filter paper and a secure side seal, it reduces wind pressure loss and prevents secondary contamination. The filter is reusable and can be easily washed and serviced for optimal cleaning. It is recommended to replace every 1 3 months depending on usage. This package contains two filters. Dreame RHF1. Product type: Filter, Suitable for vacuum type: Robot