If I could rate this product I wouldn't rate it with stars. the first panel tests for pH, alkalinity, chlorine and water hardness. I got readings on the first three, but the water hardness was light yellow, just like it started (yellow wasn't on the chart). There is no reference to the iron test. It remained the same color as at the beginning (again not in the color chart). The next test should be for copper. The test strip retains its original color. The last test was for nitrate/nitrate. The test strip started with two different shades of green and should go from white/straw white to pink. color never changed. Thank you for taking my money. I will never buy any of your products.
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