Plain and simple, they don't work at all. Compared to testing each item with a chemistry test kit, the numbers were very different. I got a pH of 6.4 while my chemistry test showed a pH of 7.8. The ammonia was at 0 ppm while the chemical was back at 0.50. I've learned my lesson. don't be cheap I'm just thankful that I only lost 1 fish before realizing it.
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