Live oaks create a mixed-debris problem
Broad leaves are easy to see, but live oak catkins and pollen can combine with grit and moisture into a finer layer. Twigs and small seed material add structure to that layer, making it easier for debris to bridge across a gutter or collect at an outlet.
A broad screen may stop the largest leaves while allowing smaller material into the channel. Two perforated aluminum layers with offset openings move the separation point to the top of the system and add a second filtration stage beneath it.
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