The Zetag Ultra flocculant range from BASF Corporation – Water Solutions Division is a high molecular weight cationic product designed to improve dewatering efficiencies. It has been shown to offer improvements in cake solids of up to 20 percent while reducing effective doses by as much as 40 percent. Originally designed specifically for dewatering municipal sludges by centrifuge, the range has also found positive results in thickening applications, including gravity belts and dissolved air, as well as in other industries where sludge is processed at high temperatures and extremes of pH. 800/322-3885; www.watersolutions.basf.com.