I have used them in the past. But only to decide that I am below 50 ppm of malic acid. They work great for me for that. But even after they say I am below that level, I wait another 2-3 weeks.
I have used them in the past. But only to decide that I am below 50 ppm of malic acid. They work great for me for that. But even after they say I am below that level, I wait another 2-3 weeks.
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