I take care of my landlady's house, and also have a customer whose house I just painted. I really need to clean my landlady's gutters at least monthly due to all the trees around. My customer had vinyl gutter guards installed years ago. They consist of a corrugated vinyl with holes in it, that supposedly work. After being all over the house I noticed a lot of these sections were installed incorrectly, shoved under the bottom course of shingles but not under the starter course. I attended to various problems that seemed to be caused by this installation. Although the gutters were mostly clear, a couple downspouts were clogged. However, in a downpour, the rain just cascades right over these gutter guards, and the roof pitch is gentle.
I saw this gutter filter on This Old House, and wonder if anybody knows anything about it? I wonder if there are other manufacturers and if it can be purchased to do it yourself. It's like the material they put in race car gas tanks. Most gutter guard systems are a ripoff price in my experience.