My neighbor has a cartridge filter. They love it because the pool service company that closes their pool cleans it then - once a year (their pool is open about 3 months).
I have a DE filter that I maintain myself. It does a marvelous job and is quite easy to maintain. Especially if you understand that the initial DE fill follows the manufacturers requirement (a full fill), but subsequenct fills after a backflush need to be less (I do a 7 pound initial fill and a 4 1/2 pound fill after backflushing). This is because a backflush doesn't remove all of the DE (its posted on the forums somewhere).
I have a cartridge on my Softub spa. Hate the thing, but only clean it twice a year.
I think if you are going to have a pool service company do your closings, then a cartridge is fine. If you plan on doing your own maintenance, I think either sand or DE will be better. IMHO only, of course.
Man, I just notice that Carl beat me to it, and did a better job at that! But I agree with what he said.
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