Hi there! Just moved into a house with a sunken pool and a DE filter. We decided to open the filter to clean it out. We rinsed the cartridge that was inside and placed it back in. In trying to close the filter again, we tightened the ring until we hit the safety block and can’t tighten anymore. When we turned the filter back on, the top popped up a bit and we see some droplets from the bottom of the ring every few seconds. Any ideas how to remedy this?