I have water filter coming from my outside. The filter should be changed regularly. It is in a plastice container, that has a bypass, off, filter bottom. I am sure you know the type. I changed it six months ago and it needs it again. The screw on is so tight I can not get it off. I have tried a loosener like WD-40, heat from a blow dryer, light taps with the hammer. i was thinking of using an old oil filter wrench used on autos? Do you having any suggestions? I guess I am not a strong as I was when I was 20. Thanks.