I installed a big blue filter today and I was having problem with water leaking between the housing and the sump. I also bought a spare one just in case so I tried it but it too had leak. The leak was a small stream after I hand tightened the sump, then it slowed to a drop after I tightened more with a wrench for about 1/8 of a turn. O-ring was new, right out of the box, and I didn't install any filter in the sump (only for the pressure/leak test). I am afraid if I tighten it more I may have a hard time to loosen it in the future, also the instruction says hand tight, so ideally it should not leak if I tighten it only by hand.
Any ideas? This is with two new blue filters.
Any ideas? This is with two new blue filters.