300ppm Free Chlorine

SKU: 33815-300

$8.95USD or lower Each

Save More When You Buy More!
Quantity1+2+ 3+ 10+ 100+ 
Price for each$8.95USD$8.75USD$8.55USD$8.15USD$7.35USD
Your savings - 2.23%4.47%8.94%17.88%
[4.7]   3 Reviews    | Write a Review

Buy Indigo™ 300ppm free (available) chlorine test strips; for only $8.95 /100 strips; buy more & and save with our extended shelf life.

Confused about how to dilute? Use our free Chlorine bleach dilution calculator to take out the guesswork.

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


Use our bleach dilution calculator to take out the guesswork out of trying to calculate how to prepare a 50, 100, 200 (or other) ppm chlorine solutions. 

Results in 5-10 seconds with readings at 25-50-100-200-300 ppm for free (available) chlorine bleach concentration.

  • Indigo™ test strips have a guaranteed minimum 3 year shelf life but are stored in desiccant lined vials so actual shelf life can be 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
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
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
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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