I got this used fluval from a private sale, the guy had it up and working and drained his tank to sell me the filter. I get the filter home, rinse and change the medium but when I close the lid clamps the thing leaks like a devil. It won't hold water for nothing. It comes out the lid seams as fast as I pour it in the top.
So I changed the O-ring....no different.
Is this filter hooped?