Sounds like the cartridge is either not seated properly or that there is a tear in it somewhere. Check between evey pleat. What is your pressure gauge reading? If it is very low there is a problem. Most of the cartridge filters I have seen ususally run in the neighborhood of about 15-25 psi when clean but then again I haven't seen that many of them. If the water is bypassing the cartridge somehow your pressure will be low.
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