I have a Hayward CX12002 filter on my system. Several weeks ago I noticed that it was leaking between the top part and the bottom part. I opened the unit up and the o-ring gasket was in very bad shape. The unit is about 12 years old. I purchased a new o-ring and some gasket lube. That seemed to fix the leak. Yesterday I noticed that it has started leaking again, not much just some moisture on the side of the filter. Any ideas other than replacing the whole filter?