the filter was purchased approx 3-4 yrs ago, I took the filter back to the lfs
where it came from in desperation this morning, lol I turned up with the cannister all my hoses in a large bucket and my trusty screw driver.
got them to run their eye over it (thinking it might be something small and stupid) but no it wasn't that easy, they put a new tapfitting on and ran a test, 5 mins later 5 liters later lol so we did the ultimate test.
separated the top from the header exposing the internal view, this ment no clips to hold the header down when the water pressure started, I put my weight on the header the lfs
owner held the coupling on and another guy released the water, saw immediately where the water was coming from. Around the primer, on this model the pump head is also a push primer for the pump. anyway the lfs
owner rang the new zealand importer for Eheim and they are getting the filter back there for a service and that should be the end of it when I get the filter back.
so at the moment im pumping as much oxy via an air pump into the tank to make up for the lack of filtration.
Hopefully I'll get the pump back at the end of the week.
long story for such a short question Zagz