Total Residual Free Chlorine (Cl) Back Catalog number: 54124 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0633.25-K-IO 2,6,10,14,18-Pentamethylheneicosane, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 66519-77-5 Price on request 685530 4-n-Nonylphenol-di-ethoxylate, 100 µg/ml, Acetoni Price on request 673608 tau-Fluvalinate, 100 µg/ml, Ethyl acetate, 5ml Price on request