Engineering firms throughout USA have developed fairly uniform specifications for flocculator-type mixers. Each engineering firm has its own special requirements, such as a preferred mixer brand (or equal) and various specific requirements. However, most flocculators generally fall under these listed guidelines. The intent of these specifications is to level the playing field between mixer suppliers by insuring minimum requirements that will ensure a satisfactory service life. For large projects, engineering firms are generally contracted to handle these requirement. This information is generally useful for existing treatment plants that is interested in either the replacement of and existing mixer or for other small projects with tight budgets.