How can I check that water in my espresso machine is flowing correctly?
First, clean the showerhead screen extremely well. Then do a flow test through the brew head (without the portafilter). Water should pour at a rate of 8 fl. oz. per 35-45 seconds, or less. If it pours closer to 50 seconds, then the machine needs to be descaled.
To verify that the portafilter is okay, do a water flow test with an empty portafilter. The rate should be approximately 2 fl. oz. of water per 15-20 seconds. If it’s closer to 25 seconds, check the basket screen and possibly soak it in decalcification solution.