Our Sirena replacement separator brush will keep the filter in your Sirena Heavy Duty Vacuum Cleaner clean. This tool helps clean the separator which accumulates dirt over time and needs to be cleaned once every few weeks by unscrewing the retaining bolt with the wrench part and brushing through the fins with the brush part. We recommend doing it in warm soapy water for maximum cleaning efficiency. Once cleaned, when re-installing the separator, the retaining bolt must be screwed back on but not over-tightened.