How to measure "change" in TDS through a TDS sensor rather than absolute TDS

Other Hardware Sensors
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I am using a [TDS sensor] to measure the TDS change.

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Use serial print to show you the value returned by your sensor to a variable. Decide on a time or an action to store value from sensor to another variable, print this. Compare the two in whatever mathematical way you wish and store the answer in another variable. Print this

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