Foam-A-Tac 435 chemical antifoam additive from Enterprise Specialty Products impacts foam by destabilizing froth with a physical interaction, rather than biological or chemical control methods. It is effective and consistent on all biological-based foam, whether the source is filaments (such as Nocardia or Microthrix parvicella) or a result of advanced MCRT/SRTs and/or high MLSS. The advanced formulation is nontoxic and nonhazardous, does not contribute nitrogen and phosphorus nor inhibit their removal, does not impact sludge respiration and is effective at extremely low doses. 864/984-7700; www.enterprisesp.com.