Exaxol Fresh Water Standard, Moderately Hard, 207ppm TDS, (80-100 mg/L as CaCO3)

Fresh Water Standard, Moderately Hard (80-100 mg/L) by Exaxol, catalog numbers T70403-1 and T70403-4, is a synthetic moderately hard fresh water standard with about 207 ppm TDS and hardness of 80–100 mg/L as CaCO₃, matching EPA moderately hard reconstituted water. Available in 1 L and 4 L from MBP, a registered vendor to many research institutes across the USA.