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Drop, Swirl, Compare: Master Your Liquid Pool Water Test Kit

Oct 6
3 min read

Regular water testing helps you stay ahead of chemistry problems and keep your pool clean, comfortable, and properly balanced throughout the season. A liquid test kit provides a hands-on way to measure several important aspects of your pool water. In this tutorial, The Great Escape walks you through three separate tests—chlorine or bromine, total alkalinity, and pH—and shows you how to properly fill, mix, time, and read each sample.



Key Takeaways:

  • Rinse your test cells and caps with pool water before testing, and hold reagent bottles straight up and down for consistent drop sizes.

  • Chlorine or bromine, total alkalinity, and pH each require a different testing procedure, so pay close attention to the correct fill line, reagent, and timing for each test.

  • Proper storage matters: keep your liquid test kit closed and protected from direct sunlight and excessive heat when it isn’t being used.


Step-by-Step Process:

CHLORINE OR BROMINE TEST

  1. Rinse the test cell and cap thoroughly with pool water.

  2. Fill the small test cell with pool water to the upper fill line.

  3. Add 5 drops of OTO Chlorine Indicator using the yellow-cap bottle.

  4. Secure the cap and quickly invert the test cell a few times to mix.

  5. After approximately 10 seconds, compare the sample color with the chlorine color standards to determine your free chlorine reading.

  6. Set the sample aside for 2 minutes.

  7. Compare the color again to determine your total chlorine or total bromine level.

TOTAL ALKALINITY TEST

  1. Fill the larger test cell halfway to the lower fill line.

  2. Add 1 drop of Chlorine Neutralizer Number Four using the green-cap bottle, then swirl to mix.

  3. Add 2 drops of Total Alkalinity Indicator Number Five using the blue-cap bottle and swirl again. The sample should turn blue.

  4. Add Total Alkalinity Acid Demand Number Three from the white-cap bottle one drop at a time.

  5. Swirl the sample after every drop and keep count as you go.

  6. Continue until the sample changes from blue to yellow or clear—typically around 10–15 drops.

  7. Multiply the total number of drops by 10 to determine your total alkalinity reading.

pH TEST

  1. Fill the larger test cell with pool water to the upper fill line.

  2. Add 1 drop of Chlorine Neutralizer Number Four for every 2 parts per million of chlorine present in the water.

  3. Add 5 drops of Phenol Red Number Two using the red-cap bottle.

  4. Invert the test cell several times to thoroughly mix the solution.

  5. Allow the sample to sit for 2 minutes.

  6. Compare the sample with the pH color standards on your test kit to determine your reading.


Resources & Explanations:

  • Liquid Test Cells & Color Standards — The different fill lines establish the proper sample amount, while the color standards provide the reference for reading chlorine, bromine, and pH results.

  • OTO Chlorine Indicator — The yellow-cap reagent is used to develop the sample color needed for the chlorine or bromine test.

  • Total Alkalinity Reagents — Chlorine Neutralizer Number Four, Total Alkalinity Indicator Number Five, and Total Alkalinity Acid Demand Number Three work together to produce the color change used to calculate total alkalinity.

  • Phenol Red Number Two — The red-cap reagent develops the color used to compare and determine your pool's pH reading.


FAQs:

Q1: Why should I hold the reagent bottles straight up and down?

A: Holding each bottle vertically helps produce a consistent drop size, which is important when a test depends on a specific number of reagent drops.


Q2: How do I determine my total alkalinity reading?

A: Add the Total Alkalinity Acid Demand reagent one drop at a time, swirling and counting each drop until the sample changes from blue to yellow or clear. Multiply the number of drops used by 10 to determine the total alkalinity reading.


Q3: Why are there two different times for reading the chlorine or bromine test?

A: The first comparison is made after about 10 seconds to determine free chlorine. The sample is then left for 2 minutes before comparing it again to determine total chlorine or total bromine.


Q4: How much Chlorine Neutralizer should I use when testing pH?

A: Add 1 drop of Chlorine Neutralizer Number Four for every 2 parts per million of chlorine present in the pool water.


Q5: How should I care for my liquid test kit between uses?

A: Keep the case closed when it isn’t being used and store the kit away from direct sunlight and excessive heat. Before each test, thoroughly rinse the test cells and caps with pool water.


Understanding your water chemistry is an important part of confident pool care, and accurate testing gives you the information you need before making adjustments. At The Great Escape, we’re here to help make pool maintenance easier to understand so you can spend less time guessing and more time enjoying your pool. If you have questions about liquid testing or your pool water chemistry, contact your local Great Escape team. We’re always happy to help!

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