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They are not really determining the age of the water, but rather how long the water has been isolated from other water, and thus changing entirely as a result o
by walnutclosefarm 4y ago
They are not really determining the age of the water, but rather how long the water has been isolated from other water, and thus changing entirely as a result of local interactions with the containing substrate, and the entrained microbial life in the water. That's based on the isotope ratios of the oxygen and hydrogen in the water.