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One filter is the "big beer can" in line between the tank and the motor. The other is the "pencil screen filter" mounted at the front of the motor.
Based on what would normally be encountered from a gas tank (which is not a metal milling or sanding operation) I would think the stock GROCO or equiv filter medium would be fine. Any smaller micron capability would seem to just clog up quickly.
In addition, I'd put a weighted tube into the bottom of your tank, and draw out some fuel and take a look. Most of the junk is down at the bottom, and you may want to just pre-empt the clogging by drawing out as much of that junk as possible.