Have to remove filter, shake it, tap it, reinstall it and it will work briefly. Have purged 4 gallons of water as recommended, still only works briefly. This is now the third one to do this to me. Sadly it's the only one that fits my frig. OEM filter, now discontinued, always worked perfectly. This one provides great water when it will actually dispense. Manufacturer needs to address this as it is apparently a fairly common complaint.