Almost completed. Waited a day for the epoxy to dry. I need to cut the hose again by the looks of it. I need to switch the pump over to 3600 GPH as well.
My guess would be that you're probably not using enough cement.
I used Christy's Red Hot Blue Glue on all my PVC connections (I had about 30 to glue) and the pieces are impossible to pull apart. I had no leaks and I was a complete amatuer. I had some rigid PVC pipe as well as some flex PVC (all 2") and it worked great. I've heard that Christy's Red Hot is the best stuff out there.
Check this video out: http://www.youtube.com/watch?v=VVSYNtoWPus
In my opinion, I think the dude in the video is being a bit aggressive in removing the "excess cement." I would be more careful when removing any excess.
I normally use Christy's which does not require a primer.
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FYI. If you don't install a union at the filter, you won't be able to disconnect the system without cutting the pipes. You also won't be able to open the filter easily.
Here's mine with union.
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