• Watersafe WS425B Drinking Water Test Kit

    Watersafe
    List Price: $19.95
    Price: $13.55
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  • Pro-Lab WQ105 Water Quality Do It Yourself Test Kit

    Pro-Lab
    List Price: $12.99
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why woudn't a water quality test completely confirm the absence of substance?

heres the real qestion...
1. Although these test are fairly accurate they cannot absolutely buttress the absence of a substance. why?
...

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