Indigo® sulfite test strips are commonly used for rapid field verification of dechlorination and process control decisions, particularly during dosing, startup, maintenance, and contractor-managed operations.
Sulfite test strips are widely used for rapid, qualitative confirmation during chlorine and chloramine neutralization processes where immediate, presence/absence decisions are required. In sodium metabisulfite dosing applications, operators often need to verify whether residual sulfite is still present or has been consumed, indicating complete dechlorination before discharge, membrane protection, or downstream treatment. These strips are also commonly used during startup, maintenance, and troubleshooting as a practical cross-check alongside inline sensors and laboratory methods, helping operators isolate faults, verify analyzer readings, and make timely process adjustments without delay.
We've been selling sulfite test strips since 2007. Buy fully documented Indigo® sulfite test strips,100 strips/vial with a guaranteed 3 year shelf life (dated back from expiration date "yyyy.mm.dd").
Indigo® sulfite test strips indicate the presence of sulfite ion in increments of 10, 50, 100, 250, and 500ppm after 15 seconds.
A Certificate of Conformance is available on request after shipment.
Indigo® sulfite test strips are made in USA & calibrated with NIST standards.
Test Strip Documentation |
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| Stability Statement | Certificate of Analysis | SDS | ||
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Test strips worked as described, including the red wine citric acid method. I first did some comparisons using sulfites in water. Dipping the strips and the citric acid method gave the same result, albeit a little lower than expected. Solution was mixed to 100 ppm and both strips showed about 75. Used a similar technique on red wine, although dipping does not work. Wine with no sulfites showed zero. Added and got similar readings to the water results. Thanks for the great product and the citric acid trick.
Great place for a hard to find product. Excellent price! Quick shipping.
Thanks for letting us know. This might interest you since you are in quality control: Can 10ppm of Sulfite & Quat Really Mean Zero?