If you’ve noticed a cloudy film floating on top of your coffee it may be caused from hard water. A chemical reaction occurs when minerals in hard water and coffee combine. What actually happens is the minerals in the hard water bind to the fatty acids in the coffee. This causes the thin layer of scum to form over the top layer of a cup of coffee. The hot water acts as a catalyst for the two elements, intensifying the reaction. Nothing ruins a good cup of coffee like a slimy layer of scum floating on top. Luckily clean filtered water is just a phone call away.
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