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and beware of the tetra brand with the times trips and the supposable change every two weeks thing.. its all BULLCRAP!!!.LOL thats only an attempt to get more money out of ya, +1 to mfd and daileene,change it when it falls apart..
I got tired of buying replacement filter cartridges. I bought a giant bag of polyester stuffing and that's what I use in place of the carbon cartidges.
I third the motion. What daileene said is also absolutely correct. The only exception is if the filter itself becomes gunked up.
AquaClear does suggest that you periodically remove the water pump from the filter to clean out the impeller. Every few months or so. I burned one up once by forgetting to do that.