Works. My potassium was tested at 430ppm and I believe it is accurate as I dose Aquaforest. 1 star because the test kits they sell are old. My kit expires on 10/2018 so I have to buy a new one in 5 months no matter how much I use. The picture above clearly shows that the expiration date is 7/2020 so they were caught red-handed that this is not a short lived kit and they are overselling old items.
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