SKU: 33815-300

$9.95USD or lower Each

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Quantity1+2+ 3+ 10+ 100+ 
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[4.7]   3 Reviews    | Write a Review

Indigo® 0-300ppm available chlorine test strips can help ensure your freshly harvested tomatoes are properly disinfected and free from pathogens, only $9.95 /100 strips & 3 year guaranteed shelf life.

Chlorine (sodium hypochlorite) disinfection of postharvest wash water that may carry disease-causing organisms or potentially large concentrations of pathogens in recirculated water is an effective tomato postharvest treatment strategy.

Water chlorination requires only a few simple management steps to be effective. A concentration of 150-200ppm of available chlorine in post harvest wash water can help eliminate human & plant pathogens. While a much lower 40ppm can kill pathogens within a 1 minute exposure time, the higher level affords a buffer to satisfy chlorine demand between measurements. Routine testing helps ensure the most active forms of chlorine are present at sufficient concentrations.

Food safety requirements aim to develop non-chemical strategies for postharvest disease control. The Integrated Pest Management approach includes plant essential oils which are environmentally safe & appeal to the perceived value-added agricultural and horticultural crops of organic farming.

If you know the slightest bit about metric units & find the instructions below baffling, read: Diluting Chlorine, Peroxide or Quat Sanitizers is Easy. If chlorine ppm calculation formulas are confusing, our chlorine bleach dilution calculator can prepare any concentration of chlorine bleach disinfectant solution for any volume, from spray bottle to bucket to pool size.

Of course, if you can actually make sense of the chlorine dilution formula below, you can safely ignore the suggestions above!



Related information or images
Results in 5-10 seconds with readings at 25, 50, 100, 200, 300 ppm for free (available: HOCl & OCl-) chlorine bleach concentration. This strip has a detection limit of 2-3 ppm.
  • Indigo® test strips have a guaranteed minimum 3 year shelf life but the desiccant lining typically provides 5+ years.
  • For technical explanation, read: Sanitizer Test Strip Expiration; Good Today, Dead Tomorrow?
  • These strips measure free (available) chlorine
  • The number of strips (100) per vial is approximate.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS Calibration Fluid CoA
Indigo Chlorine 300ppm Test Strip Stability Statement
Indigo Chlorine 300ppm Test Strip Certificate of Analysis
Indigo Chlorine 300ppm Test Strip SDS Calibration Fluid Certificate of Analysis

Indigo® brand chlorine test strips are Made in USA & tested for accuracy using NIST compliant standards.

Reviews (3)

The high chlorine test strips are handy for operators to measure Free Chlorine levels to ensure adequate dosages have been achieved when disinfecting watermains and cleaning storage facilities. They arrived very quickly.

— LindaT
— Indigo:

Interesting applications, thanks for the feedback.


I am glad these are packaged in a container; we have had some in the past packaged in a paper envelope (from another company), which is hard to keep dry. They work just as advertised - the only imperfection for us is that the colors are fairly similar and it can be hard to tell at a glance what the result is. Otherwise, great.

— Lettuce
— Indigo:

Thanks for the feedback. The packaging for most sanitizer test strips come in special desiccant lined containers which is explained further in: Test Strip Expiration Dates; Good Today, Dead Tomorrow?

Some of the color charts are indeed harder to read than others. Good lighting can help. Fluorescent lighting is not as contrast friendly as natural sunlight or halogen or quartz.

These Chlorine test strips are great when you need to measure Free Chlorine levels in water at high levels of concentration.
— Great product, arrived quickly.
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