Compatible with Sora 30 only, designed as a supplement for handling extremely fine dust that the original dustbin cannot process. 5L capacity with a dual-layer filter design: Outer coarse filter basket can be used independently. Its maximum filtration capacity is 400µm. Designed for heavy-duty initial cleanup and high-volume debris scenarios, it reduces the risk of clogging.The rear of the basket features a blocking cover that opens during wall climbing, effectively enhancing climbing capability. Inner non-woven fabric filter must be used in conjunction with the coarse filter basket and cannot be used alone. Its maximum filtration capacity is 3µm. Suitable for fine dust, algae, and other ultra-fine debris. Recommended lifespan: 40 cleaning cycles (150 hours of cleaning operation). Once the cycle limit is reached, or if any of the following conditions occur, it is recommended to purchase a replacement: a. The non-woven fabric remains noticeably grayed out or hardened after washing. b. The overall debris suction capability of the machine decreases. Features a foldable handle for convenient installation and removal.