For determination of Fluoride by Hach SPADNS 2 Method 10225, using AccuVac Ampules. The SPADNS 2 reagent formulation removes interference from chlorine without arsenic. EPA Compliant for use in Drinking Water and Wastewater reporting programs and equivalent to the EPA reference method SM 4500-F D. Range: 0.02 - 2.00 mg/L F- Pack of 25 ampules