This standard describes sodium fluoride (NaF), coarse crystalline grade, for use in the treatment of potable water. Major changes made to the standard in this revision include the following: inclusion of a section on Upflow-Type Saturator Operations (foreword II.B.); inclusion of a requirement for compliance with the Safe Drinking Water Act and other federal regulations (Section 4); inclusion of a requirement for tamper-evident packaging (Sec. 6.2.4 and 6.2.5); and, inclusion of provisional stirred/settled turbidity test procedures (appendix B).