Chlorine Test Strips

Activate™ High-level Chlorine Test Strips allow a higher and broader range test for available chlorine, with results in just 30 seconds.

Chlorine Test Strip Features:

  • Safety checks the strength of diluted bleach in 30 seconds.
  • Measures ppm of available chlorine for disinfecting purposes.
  • Ranges: 0 1,000 2,500 5,000 7,500 10,000.
  • Desiccant-lined vial helps keep strips fresh.
  • Ergonomically designed snap closure.
  • 50 strips per vial.

Test Regularly

The amount of available chlorine in bleach decreases with factors such as age and exposure to heat, sunlight, and contaminants. If your bleach solution is being used for disinfectant purposes, it is important to check its chlorine level for adequacy. The testing frequency depends on the critical nature of bleach use. Many facilities using Activate™ Bleach Dilution System have set a weekly chlorine test policy. 

How to Use Test Strips

Step 1

Dispense a sample of the bleach solution to be tested into a small, clean container.

Step 2

Dip the square pad at the end of the test strip into the bleach solution for one second.

Step 3

Remove it from the solution and wait 30 seconds to let the color develop.

Step 4

Within the next 10 seconds, evaluate the color of the pad by starting at the 10,000 ppm patch on the label chart. Carefully compare the color of the pad to the chart, evaluating the degree of yellow pigment to determine the best match. The color of the pad may not be perfectly uniform; this is normal.


On the bottom of the vial label, record the date the vial is first opened. Use the strips within 2 years of the recorded date. Always store at room temperature.


Frequently Asked Questions...

What if the color on the strip pad doesn’t match any of the color patches on the label chart exactly?

The colors don’t have to match exactly; however, to determine an accurate match, evaluate the degree of yellow pigment on the strip pad compared to the color patches on the label chart. It can be helpful to obtain a consensus among 2 or 3 people if matching is difficult. Just remember to make the evaluation within 10 seconds after the initial 30-second color-development interval.

Are the test results accurate if the strip pad is blotchy?
Yes, the color on the strip pad may not be uniform; this is normal.

Is it ok to touch the strip pad?
No, do not touch the strip pad. Hold the test strip by the opposite end of the strip until the evaluation is complete.

Can we spray the bleach on the strip instead of dipping the strip into the bleach?
Safety and accuracy are best achieved by dipping the strip into the bleach solution.

Can we test low-level bleach solutions such as 200 ppm with these strips?
For the best results, only test 1,000 to 10,000 ppm solutions with these strips. Use a low-level test strip to test lower strength solutions.

Why do we have to keep the vial lid closed?
Prolonged exposure to moisture can affect the accuracy of the test pad. Although the inside of the vial is lined with a desiccant coating, it is important to keep the lid tightly snapped shut to keep the strips clean and dry.

Do the strips have a shelf life?
It is best to use the strips within 2 years of your initial opening of the vial. Record the opening date on the lower right side of the vial label.

Deardorff Fitzsimmons Corporation is dedicated to solving problems. Our goal is to manufacture products that save time, money, and waste – while increasing safety.

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2947 State Hwy 38

Drain, OR 97435