Let me be the first to congratulate you on sorting the problem out Heks.
On the other hand I cant believe the problem has taken 45 posts and 2 weeks to sort out, Barry O'Speedwagon nailed it in post 5, contaminated water in the boiler was the obvious answer.
What is worrying is the fact that inexperienced people are using descale chemicals without the knowledge to safely carry out the process, the only clue here that the water in the boiler was contaminated is the addition of milk which immediately curdled, assuming only shots or long black was being consumed there is a strong chance this stuff could have been ingested, not sure how toxic the stuff is, however I certainly wouldn't want to drink it.
Chris at Talk Coffee is correct, if you don't know how to do the job pay someone who does.

On the other hand I cant believe the problem has taken 45 posts and 2 weeks to sort out, Barry O'Speedwagon nailed it in post 5, contaminated water in the boiler was the obvious answer.
What is worrying is the fact that inexperienced people are using descale chemicals without the knowledge to safely carry out the process, the only clue here that the water in the boiler was contaminated is the addition of milk which immediately curdled, assuming only shots or long black was being consumed there is a strong chance this stuff could have been ingested, not sure how toxic the stuff is, however I certainly wouldn't want to drink it.
Chris at Talk Coffee is correct, if you don't know how to do the job pay someone who does.

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