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Slo Mo Bottomless Extraction

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Silly question but is it a sign of better/worse extraction when you have beads covering the full bottom of the portafilter FIRST before starting to drip from the central column? I always assumed that in the case such as the one in the video the water finds a path of least resistance centrally first and the puck will be extracted unevenly center Vs edges, with edges extracted later. Have I got this wrong?



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Beading over the full puck before the central column is a sign of an even extraction. Or at least to the best of my knowledge. 

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Down with this sort of thing. 

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