A larger filter would hold more of the rust particles so it would need changing less often.
Here is a 20" Big Blue housing with a 5 micron sediment filter:
20 Inch Big Blue Whole House Water Filter Housing #20 from Ametek, USFilter, and Pentek DGD-5005-20 Water Filters and Pentek DGD500520 Sediment Filter for 20 inch Big Blue Whole House Housings
I wouldn't think you would want the rust particles to go into the house since it would cause discoloring in the showers, tubs, and not help the life of the appliances.
You could use the larger mesh size so it didn't clog up with smaller particles but then use the larger filter (20" x 4.5") to filter out the smaller particles.
Thank you,
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