Residual Quat Test Strips for Leafy Greens

SKU: 33819-100

$15.25USD or lower Each

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Safeguard leafy greens from harmful pathogens and excess quat residues with Indigo® QAC test strips. Verify wash water and hydroponic system sanitation, protect against E. coli and Listeria, and meet HACCP, FSMA, and organic certification standards.

Residual quat test strips are convenient & economical tools for growers, packers, and processors of leafy greens such as spinach, kale, romaine, and spring mixes. QACs or “quats” are widely used as sanitizers in food production facilities but excessive residue levels may risks to consumer safety and fail organic certification standards.

Regulators such as the FDA (Food and Drug Administration), USDA National Organic Program (NOP), and third-party auditors under the Harmonized GAP standards require sanitizing chemicals be applied correctly and rinsed when necessary, leaving no harmful residues on produce. These test strips provide a quick, inexpensive way to confirm that sanitizer levels fall within safe ranges, reducing the risk of inspection failures, costly recalls, or loss of organic status.

All Indigo® Quat (QAC) test strips come in 100 (not 50) strips per pack & 3 year minimum guaranteed shelf life backed by a Certificate of Analysis, Stability & SDS documents as listed below; Certificate of Conformance on request. Be prepared for any health & safety audit or inspection.
Details Specs Docs Reviews
Details

Best Practices for Leafy Greens & Hydroponics

  • Test for sanitizer residues on harvesting bins, conveyor belts, and hydroponic channels, ensuring ≤100 ppm, using Indigo® residual QAC test strips which detect down to 10 ppm.
  • Pay special attention to hydroponic nutrient reservoirs and irrigation systems, where sanitizer overuse can alter plant uptake or mask contamination.
  • Maintain compliance with FDA’s Produce Safety Rule and GlobalG.A.P. standards.
  • Document sanitation verification to support both conventional field crops and controlled environment agriculture (CEA) certifications.

 

The directions on the test strip bottle are for testing liquid quat solutions. Test surfaces for residues by first wetting the strip's testing pad with water (deionized or distilled if available). Then press against fruits, vegetables, cutting boards, utensils, etc. for at least 10 seconds & then compare against the color chart.

Levels less than "10" ppm are impossible to determine but some organic certifications call for "0" ppm. This is because water alone causes a reading of 10ppm. Read more in our blog on What 10ppm really means? when measured on surfaces of knives, cutting boards, fruits or vegetables.

As part of best practices protocols, hydroponic growers should rinse equipment thoroughly after quat sanitation, replace nutrient solution regularly, and test with low-level quat strips (10–100 ppm range) before reintroducing crops.

Related information or images
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Specifications

Swish strip in liquid 5 times & then compare to color chart after 10 seconds for reading at ≤10-30-60-80-100ppm ppm for quaternary ammonium disinfectant 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 any quat formulation
  • Indigo® QAC test strips are calibrated for Oasis 146: see details. Consult your supplier if necessary.
  • The number of strips (100) per vial is approximate.
Documentation

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Quat - QAC Test Strips 10-100ppm Stability Statement Indigo Quat - QAC Test Strips 10-100ppm Certificate of Analysis Indigo Quat - QAC Test Strips 10-100ppm SDS

Indigo® brand test strips are Made in USA & tested for accuracy using NIST compliant standards. Be prepared for any health & safety audit or inspection.

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