These guards range in price and usefulness.
Best way to keep leaves out of your gutters.
This gutter insert is a plastic mesh foam filter.
This will at least help reduce the amount of leaves you will have to clean up.
Small debris sometimes gets in but usually washes out the downspouts without a problem.
Your job brushing aside any accumulated debris from time to time to prevent runoff from cascading over the face of the gutter.
Surface tension guards work very well with leaves and other large debris.
If you live in house that has any trees around it gutter guards are going to be a great investment.
They must be brushed off from time to time or the debris that sits on them will disintegrate and eventually clog the foam or wire.
Surface tension from the curved lid channels water into the holes without taking leaves with it.
It blocks leaves from entering but easily allows water through.
Make sure you especially trim the branches that overhang your gutters.
The theory is similar to flat screens described above in that the insert will let water through and keep debris out of the gutter the top of these inserts are essentially flat when installed into a gutter.
Gutter guards come in different materials and designs but all hold a common purpose keep the leaves and debris out of your gutters.
The answer to this is going to be to install gutter guards.
It installs under the gutter ferrules to protect it from blowing away in high winds.