AquaChek 511242A 4-in-1 Free Chlorine Test Strips for Swimming Pools

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Swimming Pool Chlorine Test Strips by AquaChek. These test strips test for four key values Free Chlorine, Cyanuric Acid, pH and Total Alkalinity. A quantity of 50 strips per bottle. To test the water, just dip an AquaChek strip in the pool water for one second, and remove immediately. Compare the colors on the stip to the bottle, thats it! You get test results in seconds! To keep your pool at its best, test each week. It's also a good idea to write down your results each time you test, so you can track changes.

AquaChek Chlorine Test Strips

AquaChekYellow is a test for Free Chlorine, pH, Total Alkalinity and Cyanuric Acid. The test pads on the strip change color to indicate the levels in your pool or spa water. Be sure to snap the lid securely closed on the AquaChek bottle immediately after dispensing a strip. This will prevent strips from spilling and keep them fresh. Store the strips in a cool, dry place, and leave the packet of drying agent in the bottle–it will keep the test strips at their best.


  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.

More Information
Product Name 4-in-1 Free Chlorine Test Strips for Swimming Pools
Manufacturer Part Number 511242A
Brand AquaChek
Substitute Part Numbers 12, 1242, 1242ABC R11/06
SKU AQC-45-1002
About the Manufacturer
Aquachek, which is a Hach brand has come to be recognized as a leader in developing and manufacturing chemical testing systems for users around the world. Their manufacturing facility produces test strips for medical industry to the swimming pool and spa industry. The same exacting quality and product integrity into all of their chemical testing systems, including those for pool, pond and spa owners.
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