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Xpress Flex® Testing System

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Analyte System Method/Chemistry Standard/Equivalance or Description Comparator Cell
Chlorine, Free Test Strip Proprietary 0–10 ppm chlorine (Cl₂) NA 9003
Borate Test Strips Proprietary 0 - 100 ppm borate (B) NA 9003
Akalinity, Total Test Strips Proprietary 0 - 240 ppm total alkalinity as CaCO₃ NA 9003
Chlorine, Total Test Strip Proprietary 0 - 10 ppm chlorine (Cl₂) NA 9003
Phosphate Test Strips Proprietary 0 - 3000 ppb phosphate PO₄³ˉ NA 9003
Hardness, Total Test Strips Proprietary 0 - 800 ppm total hardness as CaCO₃ NA 9003
Copper Test Strips Proprietary 0 - 3.0 ppm copper NA 9003
Cyanuric Acid Test Strips Proprietary 0 - 300 ppm CYA NA 9003
Salt (Sodium Chloride) Test Strips Proprietary 0 - 5000 ppm NaCl NA 9003
Iron Test Strips Proprietary 0 - 5.0 ppm NA 9003
Bromine, Total Test Strips Proprietary 0 - 10 ppm Bromine (Br₂) NA 9003
pH Test Strips Proprietary 6.0 - 8.8 NA 9003


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.