Stainless Steel DAF2 Air Flotation Machine for WWTP Sewage Phosphorus Removal Our Stainless Steel DAF2 Air Flotation Machine (Model DAF2-WW Series) is the upgraded version of the standard DAF clarifier, engineered for WWTP (Wastewater Treatment Plant) sewage pre-treatment, plant upgrading and phosphorus removal duties. The DAF2 eliminates sedimentation problems in the pre-treatment section and delivers stable flotation performance even with heavy sludge loads. Trusted by