Why pine needles create stubborn clogs
A single pine needle is narrow enough to penetrate many common screens. Once inside, needles interlock with one another and collect shingle grit, pollen, and small organic material. The resulting mat can slow water before the homeowner sees an obvious pile of leaves.
Needles can also sit across a downspout opening or elbow, where a relatively small amount of debris causes a much larger drainage problem.
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