Every time I have to open my filter to replace a lateral, or check for tunneling, I get leaks at all point of connection coming out of my filter. Eventually, they either fill in with grease, grime or grit and seal up, or I apply a little silicone sealant to the threads. I have 2 pvc unions on the in and out line, and these are the usual culprits. Also, the retaining ring under the multiport like to bleed too, but I usually put sealant around that.
Has anyone ever set their filter inside a drainpan, similar to what you would use under a hot water heater, to catch any water that would leak out and return by temporary hose back to the pool? I think next time I have to break down my filter I'm gonna try this, was wondering if anyone else has had this experience.
I'm leak-free now, had to loosen the last union and hand-tighten, then gradually tighten with rubber-strap wrench until drip stopped.