Bottomless Portafilter is specially designed for checking the coffee extraction process. It is normal to cause the liquid from the bottom of the filter basket to spray and splash when the coffee granules in the filter basket are too coarse. Uneven distribution and the wrong dose may also lead to spray.
Bottomless Portafilter can be easily used to find problems through these phenomena, so as to improve your skills of making coffee.
If there are no errors in all steps of the coffee preparation process, the coffee with beautiful color will flow out evenly from the center of the filter during extraction.
It is highly recommended that beginners use a large cup to pick up coffee or raise up the cup as highly as possibly to prevent spills.