Waste of money. According to the instructions, it takes 15 minutes. After more than 24 hours, the pH of the 0.5 liter bottle of Aquafina, which was pH 5.5, only dropped to pH 6.5. I thought my test strips had gone bad so I bought new ones and got the same result. was a no star rating I would give. Incidentally, adding 1/4 teaspoon of regular baking soda changes the pH from 5.5 to around 7.8. I'll stick with what works. I am sending them back for a refund.
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