Water Test Interferences

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General Test Interferences

Taylor Technologies has videos on General Test Interferences for:

• Calcium Hardness Test Interference - interference from copper and iron can cause a fading endpoint and some color changes before the final endpoint
• Chlorine Test Interference - high levels of chlorine > 10 ppm can cause a false low or 0 chlorine reading.
• pH Test Interference - high levels of chlorine > 10 ppm can cause a false pH reading, usually bluish purple
• Total Alkalinity Test Interference - high levels of chlorine or bromine can cause reaction to change from blue to yellow instead of green to red

The videos show ways of compensating for the interference.

Also see Taylor Technologies - Seeing Colors.