We installed our above ground pool without compacting the sand for the bottom. This will be our 4th season and I am CONSTANTLY fighting a silt problem in the nooks and cranies on the bottom. It collects in each and every dip--you can even see the different layers of sediment in some of the larger spots. Whether we just live in an incredibly dusty area or my filter isn't working on this small stuff I can't say. The sand in the filter looks perfect, no veining. I tried adding DE to my filter last year and did not notice that it helped, it just made the pool cloudy for a month or so. I'm thinking of sacrificing the 4-year old liner and compacting and smoothing the bottom and making a slight depression across the entire pool to catch this sediment so I only have to vac in one area. Has anyone fought this silt battle and won? Is there a type of automatic cleaner that works well on this problem?