DrScrabs - 29-6-2018 at 14:58
May be of interest.
Taken from
Chemicals used for treatment of water intended for human consumption –
EN 12124:2012 for Sodium sulfite
Na2SO3 min. 95% bw
Iron (Fe) max. 25 mg/kg
Antimony (Sb) max. 2 mg/kg
Arsenic (As) max. 1 mg/kg
Cadmium (Cd) max. 1 mg/kg
Chromium (Cr) max. 1 mg/kg
Lead (Pb) max. 2 mg/kg
Mercury (Hg) max. 0,5 mg/kg
Nickel (Ni) max. 1 mg/kg
Selenium (Se) max. 1 mg/kg
[Edited on 29-6-2018 by DrScrabs]