The use of inaccurate testing equipment, contamination of the water sample, or possibly an error in the claim itself. It is recommended to re-test the water using a different testing method or consult a certified water quality professional for further analysis.
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Answer:
The use of inaccurate testing equipment, contamination of the water sample, or possibly an error in the claim itself. It is recommended to re-test the water using a different testing method or consult a certified water quality professional for further analysis.