Check the listing for details. Hach DPD Total Chlorine Reagent Dispenser Swiftest. Condition: New. Listed at 129.00 USD. Brand new Hach Swiftest DPD Total Chlorine reagent dispenser. Complete with one full reagent vial. Part number 2802400 DPD Total Chlorine Reagent Dispenser and reagent vial, approximately 250 Tests. USEPA accepted for reporting drinking water and wastewater analyses using Hach Method 8167. Free chlorine and potassium iodide Swiftest dispensers also available. Sample Size: 10 mL. Range: 0.02 to 2.00 mg/L. Contains 1 refill vial with enough reagent for approximately 250 tests