I have tested my aquarium, well water and river water (Osage River in Missouri). I compared the readings of this Ultimate brand to 7 other test brands I have. I compared this Ultimate brand to samples of my well water tested by our health department and a sample at the university for more parameters than our health department. The readings of this Ultimate Life 2O brand are completely wrong. These strips do not read minerals in water. I've added chemicals and minerals to the samples, but they still won't read these strips. Other expensive tests show differences when I add additives to a sample. I test my test device.
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