Blimey I use 10%! Not caused an issue and it’s been done dozens of times on my machine
I usually use closer to 10% too!
Then again, I've never put it through copper pipes before so maybe Moccamaster aren't bullshitting about that. I suspect that they are though.
@Stonehedge started
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Blimey I use 10%! Not caused an issue and it’s been done dozens of times on my machine