WS Disinfection By-Products - Cal Check 4 Back Catalog number: 93986 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66157 2,3,3’,4,4’,5’-Hexachlorobiphenyl (157) Price on request 93443 Citric acid [0.2% wt] Price on request 59410 WP Demands Standard Price on request