You can measure the stabilizer (cyanuric acid) level in your pool using a test kit, like a Taylor test kit. Here's how, based on the provided information:
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Use a specialized testing vial: Look for a vial that has a black dot at the bottom.
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Add the reagent: Gradually add the reagent to the vial.
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Observe the black dot: Keep adding the reagent until the black dot at the bottom of the vial completely disappears.
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Read the measurement: Once the black dot is no longer visible, read the cyanuric acid level on the side of the vial. The marking shows the level of stabilizer in parts per million (ppm).
It is very important to follow the specific instructions on the test kit you purchase, as instructions may vary. A pool supply store can also test your water sample.