Marineland H.O.T hob filter shoting out microbubbles

this is a great filter to start off water is super clear but it keeps shoting out micro bubbles every minute or so cant figure out why anyone have one and had this problem or have any ideas on how to stop this from happening cant figure it out please help
 
if you just setup the filter you may still have trapped air in the system. What i usually do is shake it a bit and see if i cant help the trapped air work its way through.
 
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