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9-Way Test Kit for Free Chlorine, Total Chlorine, Bromine, pH, Alkalinity, Hardness, CYA (DPD)

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Analyte System Method/Chemistry Standard/Equivalance or Description Comparator Cell
Hardness, Calcium Drop test EDTA titration (includes inhibitors to prevent metal interference) 1 drop = 10 ppm calcium hardness as CaCO₃ NA 4034
Cyanuric Acid Visual determination Turbidimetric 30, 40, 50, 60, 70, 80, 90, 100 ppm CYA NA 9197
Chlorine, Free & Total sureCHECK comparator DPD .5, 1, 2, 3, 5 ppm chlorine (Cl₂) 9782 NA
pH w/ acid/base demand sureCHECK comparator Phenol red 6.8, 7.2, 7.5, 7.8, 8.2 9782 NA
Alkalinity, Total Drop test Blended indicator 1 drop = 10 ppm total alkalinity as CaCO₃ NA 4034
Bromine, Total sureCHECK comparator DPD 1, 2, 4, 6, 10 ppm bromine (Br₂) 9782 NA
Test Parameter Description
Chlorine levels > approx. 10 ppm may bleach out indicator; to prevent, dilute sample with DI water as necessary and retest. Chlorine
High halogen level may change indicator reaction from green/red to blue/yellow; to prevent, add thiosulfate prior to testing. Total Alkalinity
Sanitizer levels > approx. 10 ppm may cause a blue-purple color resulting in false high readings. Wait for sanitizer level to decrease to normal levels and retest to assure an accurate reading. pH
Other halogens and oxidized manganese may cause positive interference. Chlorine
Metal ions may cause interference; to prevent, add titrant containing EDTA to sample before buffer and indicator, then test as normal making sure to count drops of titrant added initially in total required to reach endpoint. If interference still occurs, dilute sample with DI water as necessary and retest. Calcium, Magnesium, Total Hardness
Iron > 10 ppm may cause negative interference. pH


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.

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