Maybe there needs to be better instructions with installation. It looks to be easy. However, every time I put in a new filter the water line hisses for about 3-4 months then gradually goes  away. this year the pump made knocking noises until up to a month ago. It didn't do that with the original filter that was in the fridge when I bought it. just with the new filters I bought from you. Any suggestions? Don't tell me it may be something with the fridge. I think I might not be doing something in correct fashion that is not in the instructions. I've read the owners manual and followed those instructions to the T.