Beverley&Ken wrote:
As Bob said, "Turn off your water supply and try again" In addition, open at tap or two in order to relieve all pressure in the system. That is the only way I can change the filters at home (basically same filter housings).
Ken
Exactly. Open the faucets to relieve pressure. This will definitely help. Put a bucket underneath to collect water. Make sure you're turning the filter housing counter-clockwise. To make it easier for next time, apply some food grade silicone lubricant on the o-rings when you're re-tightening the housing.