I have a Sta-Rite System:3 PLD50 DE filter 30 sq ft. It's like a big egg shaped thing that comes apart in the middle. Last year it was really hard to put back together. This year it's just not going back together. I've replaced the gasket. I've used the proper lube. I've put all my weight onto it. My wife and I have double-teamed it. It just doesn't work. I think it's seated properly but when I turn on the pump water just pours out in places all around the seam. So I take it apart and try again. Hours wasted. So maybe there's some technique I should be trying?
If not, I'm guessing I need to buy a new filter. But we've had all sorts of other problems with this one in the past on top of what I just described. But I'll describe those later. I'm a complete non-pool person, so I might not be describing this well.