WP Total Hardness Back Catalog number: 54156 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended D4157 4,5-Dichloro-2-n-octyl-4-isothiazolin-3-one, >98%, 25g Price on request M8FOSA-I Perfluoro-1-[13C8]octanesulfonamide, 1.2ml x 50ug/ml, isopropanol Price on request 72062 Dibenzofuran-d8 Price on request