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AquaCheck Yellow Test Strips

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AquaCheck Yellow Test Strips

Product Features

  • Test results in seconds!
  • Tests for Free Chlorine, Cyanuric Acid, pH and Total Alkalinity

Product Description Description

AquaChek Yellow Test Strips Test for Free Chlorine, Cyanuric Acid, pH and Total Alkalinity Just dip an AquaChek Yellow strip in your pool or spa water for one second, and remove it immediately. You get test results in seconds! To keep your pool at its best, test at each end at least twice a week, and test your spa before each use. It’s also a good idea to write down your results each time you test, so you can track changes. Comes with complete instructions in 15 languages: English, French, Spanish, Italian, Czech, Danish, Dutch, German, Greek, Hungarian, Polish, Portuguese, Russian, Swedish and Turkish.

What's In The Box

  • 50 test strips
  • Complete instructions in 15 languages


  1. Dip a strip into water and remove immediately.
  2. Hold strip level for 15 seconds (do not shake excess water from strip.)
  3. Compare pH, Free Chlorine, Total Alkalinity and Stabilizer pads (in that order) to color chart on label. For best results on Stabilizer (Cyanuric Acid) test, pH should be between 7.0-8.4 and Total Alkalinity should be at or below 240 ppm.

Important: Keep cap closed tight between uses. Store at room temperature. Use by expiration date on cap.

Test Descriptions:


pH refers to the intensity of acid or alkaline materials in your water. If pH is too high, scale can form on surfaces in contact with the water. If pH is too low, metal parts will corrode. Adjust Total Alkalinity before adjusting the pH; this will help prevent sudden fluctuations in pH. When the pH is too low, add soda ash. When it is too high, add an acid.

Free Chlorine:

Unlike most liquid test kits that measure only Total Chlorine (Total Chlorine includes both Free Chlorine and Combined Chlorine) in pool water, AquaChek Yellow tests for Free Chlorine. Free Chlorine is "good" chlorine that is still able to keep your pool fresh and clean. Combined Chlorine is chlorine that has used up its ability to sanitize. Too much Combined Chlorine causes eye irritation and strong pool odors. To maintain a clean and clear pool, keep the Free Chlorine level in the right range. But before making any adjustments, be sure that pH and Total Alkalinity are in the ideal ranges. If the Free Chlorine is too low, add Chlorine.

Total Alkalinity:

Total Alkalinity measures the amount of alkaline substances (carbonates and bicarbonates) in your water. Alkaline substances buffer your water against sudden changes in the pH of the water. It is important to prevent pH changes that can cause corrosion or scaling of metal fixtures. Total Alkalinity should be adjusted before adding chemicals to balance pH or Free Chlorine.* If Total Alkalinity is too low, add sodium bicarbonate. If Total Alkalinity is too high, add an acid.

Cyanuric Acid:

Cyanuric acid, also called "stabilizer" or "conditioner", makes chlorine more stable when exposed to the sun’s ultraviolet rays. A low cyanuric acid reading indicates that chlorine will dissipate very quickly when exposed to sunlight. Two types of chlorine compounds, dichlor and trichlor, already contain some cyanuric acid. Cyanuric acid may build up with the continued use of one of these sanitizers. If you are using a liquid sanitizer, you will want to add cyanuric acid to the water. Too much cyanuric acid in the pool can reduce chlorine efficiency and contribute to scale, stains or cloudy water.

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AquaCheck Yellow Test Strips 511242A
$9.05 In stock