Seems normal, can be washed off if the water sits in the jug too long and becomes too alkaline , or purchases mineral particles , . Alkaline water is very, very healthy, so buying it is a step in the right direction. I would also buy an electric pH meter for $10 and a particulate matter detector for $2 because 10 is the highest pH I want and...50 to 1.35 is the highest I want, and I like pure-tasting mineral water to taste the way I want it to taste in the shortest possible time and in the simplest possible way, and this allows everyone to determine their personal taste preferences for themselves.
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