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6-Way Test Kit for Free Chlorine, Total Chlorine, Bromine, pH (acid demand), Alkalinity (DPD)

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Analyte System Method/Chemistry Standard/Equivalance or Description Comparator Cell
Chlorine, Free & Total sureCHECK comparator DPD .5, 1, 2, 3, 5 ppm chlorine (Cl₂) 9782 NA
Bromine, Total sureCHECK comparator DPD 1, 2, 4, 6, 10 ppm bromine (Br₂) 9782 NA
Alkalinity, Total Drop test Blended indicator 1 drop = 10 ppm total alkalinity as CaCO₃ NA 4034
pH w/ acid demand sureCHECK comparator Phenol red 6.8, 7.2, 7.5, 7.8, 8.2 9782 NA
Test Parameter Description
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
High halogen level may change indicator reaction from green/red to blue/yellow; to prevent, add thiosulfate prior to testing. Total Alkalinity
Iron > 10 ppm may cause negative interference. pH
Chlorine levels > approx. 10 ppm may bleach out indicator; to prevent, dilute sample with DI water as necessary and retest. Chlorine


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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6-Way Test Kit for Free Chlorine, Total Chlorine, Bromine, pH (acid demand), Alkalinity (DPD), Spanish


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Booklet, I Never Liked Chemistry, 50-pack


Watergram® Water Balance Calculator (circular)


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