I think it depends on your local climate and setup. We don't get a lot of dust or birds, here, but other people do. We also don't have any trees around the house, and that helps a bit, too.
We go through a first flush, and then have a sediment and charcoal filter in the house. Also, we have a self-cleaning overflow, which is basically a pipe that picks up sediment fromt he bottom of the tank whenever it overflows.
http://www.flickr.com/photos/velacre...7630019884153/
Here's a photo of that:
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