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Commercial Colorimeter Kit, Free and Total DPD Chlorine (0-10 ppm), pH (6.5-8.5), Total Alkalinity (0-250 ppm), Calcium Hardness (0-800 ppm), Cyanuric Acid (7-120 ppm)

UPC Barcode:


Analyte System Method/Chemistry Standard/Equivalance or Description Comparator Cell
Chlorine, Free & Total Electronic meter DPD 0-4.00 or 0-10.0 ppm chlorine (Cl₂) NA 9601
pH Electronic meter Phenol red 6.50-8.50 NA 9601
Chlorine, Free & Total Electronic meter DPD 0-8.0 ppm chlorine (Cl₂) NA 9602
Alkalinity, Total Electronic meter Bromocresol green 0-250 ppm total alkalinity as CaCO₃ NA 9601
Hardness Calcium 800 Electronic meter Alizarin red 0-800 ppm calcium hardness as CaCO₃ NA 9601
Cyanuric Acid Electronic meter Turbidimetric (Absorptometric) 7-120 ppm CYA; by dilution: 35-600 ppm CYA NA 9601


All reagents have a shelf life, whether they are liquids, powders, crystals, tablets, or test-strip pads. If kept dry, powders and crystals are very stable; acids are also long lived. Date of manufacture is not the controlling factor when it comes to shelf life—storage conditions are more important. As with all perishables, reagents are sensitive to environmental influences and will last longer under controlled conditions.

To this end, we recommend:

  • Storing reagents at a consistent temperature in the range if 36°–85°F (2°–29°C); extreme temperature fluctuation, say from a refrigerator to a hot car trunk, causes reagents to deteriorate.
  • Keeping them out of prolonged direct sunlight. (Note: their brown plastic bottles help protect very light-sensitive reagents.)
  • Segregating reagents from containers of treatment chemicals.
  • Replacing caps immediately and tightening them carefully so that exposure to air and humidity is limited.
  • Avoiding switching bottle caps, placing bottle caps on soiled surfaces, repouring reagents into contaminated containers, or touching test strip pads.

Taylor formulates its reagents to remain effective for at least one year, with only very few exceptions (molybdenum indicator in liquid form is one; after four months old it should be tested against a standard periodically). As a general precaution, replace all reagents more than one year old, or at the beginning of a new testing season.