Don't rely on this to get definite results. I have used them in my Mystery Snail Tank, Shrimp/Fish Tank and Outdoor Goldfish Pond. Reading was very low. I used the API Master Test Kit for comparison and as I expected the API results were much higher. I rescued 16 mystery snails and they are now in a 10 gallon bottle. I do 2-3 water changes a week to keep her water safe. I skipped one to see if the results are any different. All those life slugs would be dead if I walked past these strips.
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