Starmer In Jobs Push.....right Oh!
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No best answer has yet been selected by G-FUNK. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Probably limescale. My guess is that you live in a hard-water area where the local rock is largely chalk or limestone. You probably see a white furry deposit in your kettle as well. Freezing the water causes the solubility to fall and the lime comes out of solution so you see it more clearly. It is harmless to drink.