It's the filter that never stops.
The round wash screen separates abrasive dirt and silt from clean and soapy wash water with scores of cyclonic dirt funnels. The one way Cyclone Filtration system is a passive filter that never needs replacing and does not rely on moving parts, no disposable filters, and requires no maintenance or energy to set up, use, or store. Cyclone Dirt Trap | Chemical Guys The dirt remains trapped underneath the funnels and cannot easily flow back up through the tips once the mitt is pulled out from the water.