My sand filter has started to vibrate (with a low vibration noise too) shortly after running. Its base was breaking and the whole thing was falling to the side, so I managed to get it onto blocks and straight again this week. I replumbed everything to the pump, between, and the return. But it still vibrates and now I have quite the leak under the valve when I backwash. Ideas? I assume the leak on the handle might be a spider gasket? Do those go bad every few years? I think I replaced it about 5 years ago.