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Practical Guide to the DDA Test (2,2-bis(4‑Chlorophenyl) Acetic Acid)
A straightforward, step-by-step guide to what the DDA (2,2-bis(4-chlorophenyl) acetic acid) test is, how to perform it safely, and how to read the results.
Guide to Perchlorate (PERC) Testing
A straightforward guide to the perchlorate (PERC) test that explains why it matters, how the test is done, and what your results could mean for your water and health.
