On our Stainless Steel Micro-Mesh gutter guards, we use a 30 mesh (that is 30×30 holes/square inch), which is more effective than smaller hole sizes at keeping out pollen. The 30 mesh is the perfect size for managing rainwater into the gutter while keeping out all the leaves, pine needles, and even roof grit. If pollen ever does clog an area of the micro-mesh, you can unclog it with a gutter cleaning brush like ours, found here.
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