Chemical Guide
Water treatment chemicals — how much to use and how to stay safe.
Sodium Hypochlorite
Disinfection / Chlorination
Dose: 50 ppm for 1 hour contact time
Hazard: Corrosive, releases chlorine gas if mixed with acids
Chlorine Dioxide
Continuous disinfection
Dose: 0.1-0.5 ppm residual
Hazard: Gas generation system — professional use only
Silver Hydrogen Peroxide
Alternative disinfection
Dose: 50-100 ppm
Hazard: Oxidiser — store away from organics
Sodium Sulphite
Closed system oxygen scavenger
Dose: Per system volume & test results
Hazard: Harmful if ingested
Sodium Molybdate
Closed system corrosion inhibitor
Dose: Per system volume & test results
Hazard: Low hazard — professional use
Polyphosphate
Scale inhibition
Dose: Per water hardness
Hazard: Low hazard
Acid Descaler
Scale removal from TMVs & showerheads
Dose: Per manufacturer instructions
Hazard: Corrosive — acid PPE required
Monochloramine
Biofilm control in distribution
Dose: Per risk assessment
Hazard: Professional dosing system required