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Gutter Helmet and LeafGuard designs are based on a "nose-forward" principle. Water "clings" and flows over the nose, directly into the gutter below. The debris is safely washed to the ground below. In theory, this works well on broad leaves. Pine straw is a different "beast", however.
As long as the "nose" of the gutter guard is kept clean with no build-up accumulating on it, everything works fine. As soon as there is some build-up, you will see the rain water falling to the ground, rendering the gutter useless.
Ask the contractor if they will come back on an annual basis to check the gutter guard system and clean the nose as needed.
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