This Square Scrub SS EBG-HDVK-CMS HEPA dry vac filter easily swaps out with the one that came on select Square Scrub EBG machines with a HEPA dry vac kit. It if your filter has reached the end of its usable life, it's important to replace it. This allows the vacuum cleaner to properly capture dust, dirt, allergens, and other small particles, and to keep them from re-circulating back into the air.