Filters
They're inexpensive and they have a low profile. Mold heaven - it's a big filter that gets stuffed into your gutter in which never dries out. So much stuff gets trapped in the filter, slowing the water flow down and making the gutters very heavy. A Minnesota leaf filter is like a tray that sits in your gutters and when the shingles hang over a little bit it creates a cave, which leave get trapped into.
