The LaMotte 30ml DPD 1B Free Chlorine Reagent (P-6741-G) is a specially formulated chemical solution designed for accurate and reliable testing of free chlorine levels in swimming pools, spas, and other water treatment applications. This reagent is an essential component of water testing kits and systems used by pool and spa owners, service professionals, and technicians to maintain water quality and safety.

Key Features:

  • Free Chlorine Testing: The reagent is specifically designed for testing free chlorine levels, allowing for precise and consistent measurement of the active sanitizer in pool and spa water.
  • 30ml Bottle: This bottle contains 30 milliliters (ml) of the reagent solution, providing a sufficient quantity for multiple tests, making it a cost-effective choice.
  • High-Quality Formula: LaMotte is a trusted brand known for producing high-quality testing reagents, ensuring accurate and dependable results.
  • Easy to Use: Conducting free chlorine testing using this reagent is straightforward, typically involving mixing the reagent with a water sample and observing color changes.
  • Water Quality Maintenance: Accurate measurement of free chlorine levels is vital for maintaining water quality, sanitation, and swimmer safety.
  • Versatile Application: The reagent is suitable for various pool types, including chlorine, bromine, and saltwater systems.
  • Compact and Convenient: The compact size of the bottle makes it easy to store and transport for on-site water testing.


  1. Collect a water sample from your pool or spa using a suitable container.
  2. Follow the instructions provided on the product label or in your water testing kit for conducting the free chlorine test, which typically involves adding the LaMotte DPD 1B Free Chlorine Reagent to the water sample.
  3. Mix the reagent thoroughly with the water sample as directed in the testing procedure.
  4. Observe any color changes in the water sample according to the test instructions.
  5. Compare the test results to the provided color chart or scale to determine the free chlorine concentration in your pool or spa water.
  6. Based on the measurement, take necessary actions to adjust free chlorine levels if they fall outside the desired range for your specific pool type.

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