I wash my portafilter every fortnight, and always found metal residual around the area highlighted in the picture below. When I rub my fingers in those areas, it'll stain my skin with a dark greyish metal residual (sorta like silver paint). I suspect it might be from low grade metal of the spring, released when there's friction with the basket, possibly when locking the handle to the group.
I'm beginning to worry if this is a health hazard, can anyone check their equipment and see if you're getting the same?
Mine's a Breville BES920 stock eq, but suspect it can happen to any other machine.
I'm beginning to worry if this is a health hazard, can anyone check their equipment and see if you're getting the same?
Mine's a Breville BES920 stock eq, but suspect it can happen to any other machine.


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