For determination of ultra-low range Silica by the Heteropoly Blue Rapid Liquid™ method. Hach method 8282. Range: 3 - 1000 µg/L Set includes: Molybdate 3 Reagent Solution, Citric Acid F Reagent Solution, Amino Acid Reagent Dilution Solvent and Amino Acid F Reagent Powder for approximately 250 tests. Requires Pour-Thru Cell.