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Cloudy water from brew boiler on duetto 3

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Hi, I purchased a duetto about 5 years ago and have never descaled it. Except for changing the temperature probe once it has had no faults. I have decided to descale it and have undone the nut over the brew boiler to initially syringe out the water. To my surprise it was a milky cloudy colour. It has never come out anything but clear on the brewhead. I replaced the water with  a little clear cold tap water just to see if it would come out cloudy. A  minute later I syringed it out and it was cloudy but less so than the first time. Why is happening? I can only assume that it must be picking up some residue. Interestingly I have put the extracted water into a glass and let it rest. After resting the water cleared leaving a residue at the bottom. I have used a brita jug filter throughout.


cloudy water pic.jpg

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