The problem may be caused by large O-rings slipping off inside the filter housing. To resolve the issue: 1. Disconnect the filter from the shower head, turn the bottom of the shower filter counterclockwise until it separates from the top.  2. Check if rubber o-rings are in place. If one is damaged or disformed you can replace it with a spare one from the product box.  3. Connect both halves of the filter again. Make sure the filter cartridge is placed with the mesh up to the water flow.