The stainless steel filter is more robust than the HEPA filter and also has a more compact design. This means the dust container offers more volume to hold dust. Another advantage is that the stainless steel filter is easier to wash and easier to clean. Nevertheless, HEPA filters are high-performance filters that filter 99.9% of all suspended particles and particles from the air. The HEPA filters can also be cleaned under water or blown out using the fan function.