How Much Sodium Metabisulfite to Remove Chlorine?
To dechlorinate water with sodium metabisulfite (Na2S2O5), use the following guideline:
- Approximately 1.34 mg of sodium metabisulfite removes 1 mg of free chlorine in 1 liter of water.
- For practical applications, 1 gram of sodium metabisulfite will neutralize about 0.75 grams of chlorine.
Example Calculation:
- If you have water with 2 mg/L chlorine, you need about 2.68 mg sodium metabisulfite per liter (2 mg × 1.34).
After adding sodium metabisulfite, mix thoroughly and allow a few minutes for the reaction to complete. Always test your water afterward to ensure all chlorine is removed and avoid overdosing.
