1000ppm Free Chlorine

SKU: 33815-1000

$15.95USD or lower Each

Save More When You Buy More!
Quantity1+2+ 3+ 10+ 100+ 
Price for each$15.95USD$15.65USD$15.35USD$14.45USD$12.95USD
Your savings - 1.88%3.76%9.4%18.81%
[5]   5 Reviews    | Write a Review

Buy Indigo™ brand 0-1000ppm chlorine test strips, when you have to meet strict government regulations for food preparation & handling on cruise ships or seniors' homes. Only $15.95 per 100 strips, discounts for 10+.

Buy just 3 vials of Indigo™ 300ppm chlorine test strips & save. We're cheaper than so called "free shipping". How long are they good for? Read: Sanitizer Test Strip Expiration; Good Today, Dead Tomorrow?

Use our free Chlorine Bleach Dilution Calculator to take out the guesswork.


You can use our bleach dilution calculator to correctly calculate the amount of bleach & water needed to prepare the ppm levels indicated above. This calculator will allow for any concentration of chlorine bleach to be used to prepare a sanitizing/disinfecting solution. Watch the video:

In the case of cruise ships, food borne illnesses could spread rapidly because of the relatively crowded conditions and overwhelm on board health care facilities. These high level, 1000ppm (0.1%) chlorine test strips will determine in seconds whether your chlorine bleach solutions are at the higher strengths required.

Simply dip a strip into the bleach solution, ensuring that the small indicator pad is fully immersed for a few moments. Withdraw the strip and compare to the color chart on the pack for immediate, accurate readings.

  • Indigo™ test strips come in desiccant lined bottles for enhanced shelf life
  • If properly stoppered, strips have a minimum guaranteed 2 year shelf life.
  • Strips can be used 5 years or more if unopened after purchase.
  • These strips measure free (available) chlorine
  • The number of strips (100) per vial is approximate.

Test Strip Documentation

Stability Statement Certificate of Analysis


The following table shows how much bleach is needed to make up different concentrations of disinfectant based on an initial concentration of 5% (most store bought bleach sold in North America is rated at 5.25% but loses strength with time).

  1. Choose a container large enough to hold the final amount of diluted bleach you want to make.
  2. Measure & pour into the container the amount of 5% (initial) chlorine bleach you need.
  3. Fill the container with water to the level of the Final Volume.
  4. For concentrations other than 5%, use our Sanitizer Dilution Calculator to determine what you need. 
  5. If you are unfamiliar with millilitres (mL), you can use this Metric to American volume converter.
  6. If you don't have the exact measuring tool round up, not down.

Amount of 5% Chlorine Bleach to Make Final Volume
250 (ppm)
ml Bleach
500 (ppm)
ml Bleach
1000 (ppm)
ml Bleach
Volume (mL)
1.25 2.5 5 250 (~1 cup)
2.5 5 10 500 (~2 cups)
5 10 20 1000 (~US Quart)
19 38 76 3.8L (US Gal.)

You can view the structure of the chemical indicator for this strip by clicking on: 3,3’,5,5’ – tetramethylbenzidine.

Here is a brief note from the Center for Disease Control on how to reduce the risk of getting a norovirus based illness on cruise ships, in nursing homes, daycare of schools.

Reviews (5)
Ordered a few different testing strips. I was very happy with the quality, shipping and customer service. The price was also great and the detailed descriptions on the products made the ordering process super fast which I truly appreciate. Will be ordering again.
Have passed on the name of the company to others looking for the same product. Great customer service and price
— Jessica
— Indigo: Thank you for kind words and feedback.
Great company to work with. They emailed straight away to let me know when it was going to be delivered and any delays. Good pricing and in stock. Will use them again.
— Julie
After searching online for 1000 ppm test strips, I found these at Indigo Instruments, and they were exactly what I needed, plus very reasonably priced! In an era where it is hard to find good customer service, I was pleasantly surprised when Chris answered all my questions, and made sure the product I ordered was what I was looking for! He was super helpful and knowledgeable. We received the product quickly and would not hesitate to order from Indigo again. Thanks, Indigo!
— Nancy
— Indigo: Glad we could help.
Indigo Instruments was great to work with. My package arrived in a timely matter and they contacted me following my delivery to make sure everything made it okay. I am very please with my service from this company.
— Taiya
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