1. Maintenance-free Dirty Water Tank with Built-in Stir 2. 16 Nozzles Applying Fresh Water 3. Self-cleaning Scraper & Rolling Track Mop Unlike traditional mops that may spread mess, Narwal Flow 2 uses the self-cleaning mop that refreshes with every step—removing stains instead of spreading them. Dual water tanks work in sync to deliver water in 16 nozzoles and collect dirty runoff, while a scraper wipes residue off the mop for continuously lasting freshness.