20 mg/L = 20 ppm
Just one of the many problems with test strips. It worries me how many medical tests are done with strips, these days.... They're ok, but I never get a true color match...
20 mg/L = 20 ppm
Just one of the many problems with test strips. It worries me how many medical tests are done with strips, these days.... They're ok, but I never get a true color match...
PoolDoc / Ben
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