This video shows how to use a bottomless portafilter to diagnose channelling. This is when water doesn’t evenly flow the the puck but exits through fractures in the puck causing channels. This causes over extraction from some parts and under extraction from others. The initial flow is acceptable. At about 23 seconds you can see a small jet lasting for 1 second indicating that the puck preparation could be improved. A jet lasting for longer would indicate significant issues with puck preparation. The flow is relatively fast as I aim for 1:2.5-3 ratio in 25-35 seconds. Overall the flow from the portafilter is just about acceptable. #espresso #coffee #coffeeaddict #coffeelatte #channeling #barista #baristaskill #homecoffee #lelitbianca #flowcontrol #coffeelover #baristaskills

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