How to Mix Sodium Metabisulfite for Dechlorination

Materials Needed

  • Sodium metabisulfite powder
  • Clean water
  • Mixing container (plastic or glass)
  • Measuring scale and cups
  • Stirring stick or spoon
  • Personal protective equipment (gloves and goggles)

Step-by-Step Instructions

  1. Determine the Dose:

    The typical dosage for dechlorination is 1.34 grams of sodium metabisulfite per 1000 gallons (3,785 liters) of water to neutralize 1 ppm of chlorine. Adjust according to the chlorine concentration present.

  2. Prepare the Solution:
    • Fill the container with a known volume of clean water.
    • Gradually add the measured sodium metabisulfite powder to the water.
  3. Mix Thoroughly:
    • Stir the solution until the powder is fully dissolved. Use a plastic or glass container; avoid metal as the solution is slightly acidic.
  4. Apply the Solution:
    • Add the prepared solution slowly to the water to be treated, ensuring even distribution.
    • Allow a few minutes for dechlorination to occur before using the water for its intended purpose.

Safety Precautions

  • Wear protective gloves and goggles when handling sodium metabisulfite.
  • Store chemicals away from children and pets.
  • Ensure good ventilation in the working area.

Additional Tips

  • Prepare only as much solution as needed; sodium metabisulfite solutions lose potency over time.
  • Test water for residual chlorine before use if accuracy is critical.

Note: Always follow local regulations and manufacturer instructions for chemical dosing and disposal.