1) furnace filters come in varying grades of filtering ability. The best will filter out playa dust. However, the best also present the highest resistance to air flow. It's a trade-off. 2) My TurboKool swamp cooler works much like Tony described his. The pad is the filter and water flowing over or against the pad automatically cleans it, leaving most dust at the bottom and out of the way. I took out the pad out at one point to clean, and found it didn't need to be cleaned. I originally put a furnace filter over the air intake last year, but soon found it was superfluous.
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