I have a Delta two handle kitchen faucet that was installed in September of 2002. Within the past couple of months it as gone through at least a half dozen seats and springs on the hot side. I have replaced the stem twice.
It seems that the rubber gets "mangled", that's the best word I can find along the top and then there is a total failure resulting in an inability to stop the flow.
I have checked the bottom of the stem units and have not found any burrs or rough spots. When replacing the rubber seats and springs I have tried to clean out the area using a soft cloth, but I have not found any debris there.
This is only happening on the hot side. My water heater is set for just below normal and has not be altered since installation. I should note that I'm in La Crescenta, California and the water here is very hard.
I've contacted Delta via internet and they have offered to send some new seats and stems but I wonder what good that will do, since I have been replacing these already.
Does anyone have any suggestions? Is it normal for the hot side to fail so early?