The Aqunaess ARBREAK™ 8200 demulsifier has been found to be particularly effective when used in low salt water brine or in fresh water emulsions. In these cases, ARB8200 demulsifier is often formulated with sulfonates, but may be used as is. ARB8200 demulsifier exhibits exceptional ability to lower interfacial tension and, as a result, has a high degree of wetting activity. ARB8200 demulsifier can be used with effectiveness in synergistic blends with oxyalkylated phenolic resins or with sulfonic acid salts, or in blends of all three, to break crude oil emulsions of the water-in-oil type.