Five months ago installed a canister style filter for my fridge and woke up to it leaking around the seal, looked almost like where the two pieces screw together were destrorted(would'nt meet evenly. installed a new double canister filter system and within a couple of days the same thing (much damage this time)?????? I put a pressure gauge on this line and saw 60psi when water is running in the house and with no water after a few seconds it slowly climbs to 140-160+psi!!!!! The only thing differnt in the house is the installation of a sink i did in the basement. I turned the water off twice in a few days opened most the faucets to drain the water to sweat the pipe in. Could there be trapped air causing this increase from the water heater? House is 9 years old and does not have an expansion tank. If air is trapped will the removal of it stop the increase in pressure. I have no idea what the pressure was in the house before this.