Join Date: Jul 2000
Thanked 165 Times in 154 Posts
Rep Power: 16
erps is correct.
It takes time for the filter material to 'wet-out' and for the entrapped air bubbles INSIDE the filter material to 'release' and dissipate. Starting out with 'soaked' filters or 'filled filters' will greatly speed up the air-shedding process.
Of course the re-assembly of the filter housing HAS to include no 'leaks' that allows additional air uptake.