IS-5910 is a highly effective iron sequestering agent designed for application in acidizing and fracturing operations. The product is compatible with all commonly used acid types, such as hydrochloric acid, mud acid and organic acids. IS-5910 rapidly complexes with both ferrous and ferric iron generated during acidizing treatments to prevent the precipitation of iron sludges in the near well bore and well bore areas. The product is especially applicable in acidizing treatments for the removal of down hole depositions of iron sulfide. Application of IS-5910 greatly reduces the potential for acid emulsions resulting from iron sludges during acid flow back. The product is nonionic for excellent compatibility with all commonly used acidizing additives.