I bought an alkalinity tester just to make sure these sticks are working. Yes. My water is about 8.0, so slightly alkaline. I purify the water and then fill it into glass bottles with a lye stick. A liter of water and 1 stick - after about 2 hours in the refrigerator, the alkalinity of water becomes higher than 10.3. I bought 2 sticks and filled 2 bottles of water (recycled glass wine bottles) always with a stick. My cat really loves water enriched with alkaline sticks.
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