We wanted to test for lead using one strip for water straight out of the faucet and another strip for water that had leaked through our sink. Filter. One showed detectable conduction (but not how many) and the other showed none. The kit also checks for other chemicals, but we're not concerned with that. If you suspect serious contamination and don't have a good filter, you need a more thorough test. For our purposes, this turned out to work. I can't say anything about the accuracy anyway.
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