Does it actually work?  I don't know!
So I bought this hoping it would help me identify how alkaline my water (or any water) is.  No matter what water I used in the test the drops turned the water the same color.  So how can tap water (city water with chemicals)  bottled water, and bottled alkaline water all test the same?  I'm thinking the drops don't actually work they way the directions say it does.
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