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How do I test free chlorine with my Rainbow Pentair Pro 11 Test Kit?

1Answers
Darin
12/17/2025, 12:31:14 PM

Testing your pool's free chlorine level with the Rainbow Pentair Pro 11 Test Kit is straightforward. Follow these steps: First, fill the CL test cell with pool water up to the designated line. Next, carefully add one DPD #1 tablet to the filled test cell. Secure the cap and invert the test cell several times, gently mixing the solution until the tablet dissolves completely (this usually takes about 15 to 35 seconds). Once the tablet is fully dissolved, compare the resulting color of the water in the test cell to the free chlorine (CL) color standards provided in your Rainbow Pentair Pro 11 Test Kit. Note the reading and remember to save the water sample for performing the Total and Combined Chlorine test. For the most accurate results, carefully adhere to all instructions and timeframes specified in the Rainbow Pentair Pro 11 Test Kit's manual. The manual also includes additional information and troubleshooting advice.

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