Filters or specialized gutters don't work if they work at all on
roofing of any higher pitch than say a ranch style house roof.
In a heavy rain when you need the gutter the most the rain will just
run right over. Best is manual cleaning conventional gutters like i
have as many times as it takes and to slope the ground around your
house away from the walls.
Been there, done that. Watched a neighbor's Leaf Guard gutters
on a 40 pitch roof during a moderately heavy rain. Water ran right
over the edge like there was no gutter. I suspect the same would
happen with gutter screens.
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