Join Date: Sep 2009
Location: New Smyrna Beach, FL
I used an Eheim Pro 2 for about two years, and it ended up doing the exact same things you describe. The large o-ring around the primer in the pump head was the culprit. Water would collect in the head and eventually come out exactly as you would describe.
I bought the o-ring from Atomic Rice, tried lubing things really well, etc. but nothing helped. I ended up buying a Fluval G6 and haven't looked back since.