Soda dispensers at restaurants work by mixing water with a highly concentrated solution of drink flavoring. When the concentrated syrup starts to run out, the flavor is diluted. I have gone to many restaurants to find a wide variance in the quality of certain drinks. The most commonly affected drinks are Sprite and lemonade. Sometimes they taste like a 50/50 blend of the drink and water, and you regret not getting something else instead.
The solution is a small device that measures the concentration of Sprite or lemonade from a small sample. That way, you can get a small amount of the soda in your cup, use the device, and determine if you should get a different drink instead.

That's actually a good idea. I've also run into this problem before (especially with sprite). Now, the question is where can I get one of these...
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